个人中心
文章发布
退出
作者热门文章
- html - 出于某种原因，IE8 对我的 Sass 文件中继承的 html5 CSS 不友好？
- JMeter 在响应断言中使用 span 标签的问题
- html - 在 :hover and :active? 上具有不同效果的 CSS 动画
- html - 相对于居中的 html 内容固定的 CSS 重复背景？
25
4
大家好，大家好，已经使用这个网站一段时间了，但以前从未发布过(我想这是第一次)，无论如何都在做大学作业(制造学位)，所以对你们中的一些人来说可能很基础。基本上
问题出在按学生姓名搜索时，程序在底部附近无效，但一旦我输入姓名，程序就会崩溃
任何帮助将不胜感激
#include <stdlib.h>
#include <stdio.h>
#define SIZE 2
struct Student
{
long StudentID;//works
char fname[21];//works
char sname[21];//does not work
int year;//works
char course[51];//works
float results_semester_1[6];//works
float results_semester_2[6];//works
int free; // 1 means its free, 0 means its not
};
struct Student BENG[SIZE];
int menu(); // function prototype
void add_student(); // function prototype
void display_students(); // function prototype
void display_results(); // function prototype
void search_for_student_studentID(); // function prototype
void search_for_student_by_name(); // function prototype
void delete_student(); // function prototype
void initialise_database(); // function prototype
void Run_statistics_for_individual_student(); // function prototype
void Run_statistics_for_all_student(); // function prototype
int linear_search(long); // function prototype
int linear_search_sname(char); // function prototype
int main()
{
initialise_database(); // call the function to set all free positions to 1
for(;;) // infinite loop
{
switch(menu()) // calling function menu within switch
{
case 1:
add_student(); // calling function add_student
break;
case 2:
delete_student(); // calling function delete_student
break;
case 3:
display_students(); // calling function display_students
break;
case 4:
search_for_student_studentID(); // calling function display_students
break;
case 5:
search_for_student_by_name(); // calling function display_students
break;
case 6:
Run_statistics_for_individual_student(); // calling function display_students
break;
case 7:
Run_statistics_for_all_student(); // calling function display_students
break;
case 8:
display_results(); // calling function display_students
break;
case 9:
printf("Quitting Program\n");
exit(1);
default:
printf("Invalid option chosen\n\n");
}
} // end of infinite loop
return 0;
}
void add_student()
{
int freepos = -1, i, j,k,year;
for(i = 0; i < SIZE; i++)
{
if(BENG[i].free == 1)
{
freepos = i;
break;
}
}
if(freepos != -1)
{
do
{
printf("Enter student ID:\n");
scanf("%ld", &BENG[freepos].StudentID);
}
while(BENG[freepos].StudentID<10000000 ||BENG[freepos].StudentID>99999999);
printf("Enter firstname:\n");
scanf("%s", BENG[freepos].fname);
printf("Enter surname:\n");
scanf("%s", BENG[freepos].sname);
do
{
printf("Enter year of course:\n");
scanf("%d", &BENG[freepos].year);
}
while(BENG[freepos].year < 1 || BENG[freepos].year > 4);
printf("Enter course name:\n");
scanf("%s", BENG[freepos].course);
for(j = 0; j < 6; j++)
{
printf("Enter result of semester 1 Module %d:\n", j+1);
scanf("%f", &BENG[freepos].results_semester_1[j]);
}
for(k = 0; k < 6; k++)
{
printf("Enter result of semester 2 Module %d:\n", k+1);
scanf("%f", &BENG[freepos].results_semester_2[k]);
}
BENG[freepos].free = 0; // mark record as taken
}
else
printf("No position free at present\n");
}
void display_students()
{
// output the values just entered
int i, j;
for(i = 0; i < SIZE; i++)
{
if(BENG[i].free == 0) // only print taken records
{
printf("Student ID: %ld:\n", BENG[i].StudentID);
printf("Firstname: %s\n", BENG[i].fname);
printf("Surname: %s\n", BENG[i].sname);
printf("Year: %d\n", BENG[i].year);
printf("Course: %s\n", BENG[i].course);
for(j = 0; j < 6; j++)
{
printf("Result semester 1 Module %d: %0.2f\n", j+1, BENG[i].results_semester_1[j]);
} // end of for
for(j = 0; j < 6; j++)
{
printf("Result semester 2 Module %d: %0.2f\n", j+1, BENG[i].results_semester_2[j]);
} // end of for
} // end of if
} // end of for
}
void display_results()
{
// output the values just entered
int i, j;
for(i = 0; i < SIZE; i++)
{
if(BENG[i].free == 0) // only print taken records
{
for(j = 0; j < 6; j++)
{
printf("Result semester 1 Module %d: %0.2f\n", j+1, BENG[i].results_semester_1[j]);
} // end of for
for(j = 0; j < 6; j++)
{
printf("Result semester 2 Module %d: %0.2f\n", j+1, BENG[i].results_semester_2[j]);
} // end of for
} // end of if
} // end of for
}
int menu()
{
int choice;
printf("1. To add a student\n");
printf("2. To delete a student\n");
printf("3. To display all students\n");
printf("4. Find a student using studentID\n");
printf("5. Find a student by student Surname\n");
printf("6. Find student would you like to run statistics for\n");
printf("7. Find statistics for all students\n");
printf("8. Display results of all students\n");
printf("9. Exit Program\n");
do
{
scanf("%d", &choice);
}
while(choice < 1 || choice > 9);
return choice;
}
void initialise_database()
{
int i;
for(i = 0; i < SIZE; i++) // set all structure variables free to 1
BENG[i].free = 1;
}
void delete_student()
{
long search;
int position,freepos;
printf("Enter the number of student to delete\n");
scanf("%ld",&search);
position = linear_search(search);
if ( position == -1 )
printf("%d is not present in array.\n", search);
else
printf("%d is present at location %d.\n", search, position+1);
BENG[position].free = 1;
return;
}
void search_for_student_studentID()
{
long search;
int position,j,i;
printf("Enter the number to search\n");
scanf("%ld",&search);
position = linear_search(search);
if ( position == -1 )
printf("%d is not present in array.\n", search);
else
printf("%d is present at location %d.\n", search, position+1);
printf("Student ID: %ld:\n", BENG[position].StudentID);
printf("Firstname: %s\n", BENG[position].fname);
printf("Surname: %s\n", BENG[position].sname);
printf("Year: %d\n", BENG[position].year);
printf("Course: %s\n", BENG[position].course);
for(j = 0; j < 6; j++)
{
printf("Result semester 1 Module %d: %0.2f\n", j+1, BENG[i].results_semester_1[j]);
}
for(j = 0; j < 6; j++)
{
printf("Result semester 2 Module %d: %0.2f\n", j+1, BENG[i].results_semester_2[j]);
}
return;
}
void search_for_student_by_name(sname)
{
int position,j,i;
printf("Enter the surname of student to search\n");
scanf("%s",&sname);
position = linear_search_sname(sname);
if ( position == 1 )
printf("%s is not present in array.\n", sname);
else
printf("%s is present at location %d.\n", sname, position+1);
printf("Student ID: %ld:\n", BENG[position].StudentID);
printf("Firstname: %s\n", BENG[position].fname);
printf("Surname: %s\n", BENG[position].sname);
printf("Year: %d\n", BENG[position].year);
printf("Course: %s\n", BENG[position].course);
for(j = 0; j < 6; j++)
{
printf("Result semester 1 Module %d: %0.2f\n", j+1, BENG[i].results_semester_1[j]);
}
for(j = 0; j < 6; j++)
{
printf("Result semester 2 Module %d: %0.2f\n", j+1, BENG[i].results_semester_2[j]);
}
return;
}
int linear_search(long find)
{
int c;
for ( c = 0 ; c < SIZE ; c++ )
{
if (BENG[c].StudentID == find )
{
return c;
break;
}
}
return -1;
}
int linear_search_sname(char find)
{
int c;
for ( c = 0 ; c < SIZE ; c++ )
{
if (BENG[c].sname[21] == find )
{
return c;
break;
}
}
return -1;
}
void Run_statistics_for_individual_student()
{
long search;
int position,j,i,k,r,max,minsums,min=100;
float sums = 0,maxsums=0;
printf("Enter the number to search\n");
scanf("%ld",&search);
printf("The statistics for student ID:\n",search);
position = linear_search(search);
if ( position == -1 )
printf("%d is not present in array.\n", search);
else
for(i = 0; i < 6; i++)
{
sums += BENG[position].results_semester_1[i];
}
printf("Average grade over 6 subjects for this student in semester 1 is %0.2f marks\n", sums/6);
for(i = 0; i < 6; i++)
{
maxsums = BENG[position].results_semester_1[i];
}
if(maxsums>max)
{
max=maxsums;
} // end of if
printf("Max grade for this student in semester 1 is %d\n", max);
{
for(k = 0; k < 6; k++)
{
if(BENG[position].results_semester_1[k]<min)
{
min=BENG[position].results_semester_1[k];
} // end of if
}// end of for
printf("Min grade for this student in semester 2 is %d\n", min);
}
for(i = 0; i < 6; i++)
{
sums += BENG[position].results_semester_2[i];
}
printf("Average grade over 6 subjects for this student in semester 2 is %0.2f marks\n", sums/6);
for(i = 0; i < 6; i++)
{
maxsums = BENG[position].results_semester_2[i];
}
if(maxsums>max)
{
max=maxsums;
} // end of if
printf("Max grade for this student in semester 2 is %d\n", max);
{
for(k = 0; k < 6; k++)
{
if(BENG[position].results_semester_2[k]<min)
{
min=BENG[position].results_semester_2[k];
} // end of if
}// end of for
printf("Min grade for this student in semester 2 is %d\n", min);
}
return ;
}
void Run_statistics_for_all_student()
{
// output the values just entered
int i,j,k, max,min=100;
float sums,maxsums=0;
{
for(i = 0; i < SIZE; i++)
if(BENG[i].free == 0) // only print taken records
{
for(j = 0; j < 6; j++)
{
for(i = 0; i < SIZE; i++)
{
sums += BENG[i].results_semester_1[i];
} // end of for
} // end of for
} // end of if
printf("Average grade for all students in semester 1 is %0.2f \n", sums/(SIZE*6));
}
{
for(k = 0; k < SIZE; k++)
if(BENG[i].free == 0) // only print taken records
{
for(j = 0; j < 6; j++)
{
for(i = 0; i < SIZE; i++)
{
maxsums = BENG[i].results_semester_1[i];
}
if(maxsums>max)
{
max=maxsums;
}
}// end of for
}// end of if
}
printf("Max grade for all student in semester 1 is%d\n", max);
{
for(k = 0; k < SIZE; k++)
if(BENG[k].free == 0) // only print taken records
{
for(j = 0; j < 6; j++)
{
for(i = 0; i < 6; i++)
{
if(BENG[i].results_semester_1[i]<min)
{
min=BENG[i].results_semester_1[i];
}
}// end of for
}// end of for
}// end of if
}
printf("Min grade for all student in semester 1 is %d\n", min);
return ;
}
最佳答案
您的代码中存在大量错误。所有这些都是由于没有放慢速度并思考每条线(以及每条线的一部分)。 C 是一种精确语言。这是它的优势之一。无论是语法还是逻辑，都不存在足够接近的情况。找到大部分...疏忽...的一种方法是在打开警告的情况下进行编译。程序的编译字符串至少应包含 -Wall -Wextra。例如:
gcc -Wall -Wextra -o student_database student_database.c
这将捕获大部分基本语法和变量类型不匹配问题。消除每一个警告。编译器并没有意外地抛出它们。它们意味着某些东西。
话虽这么说，我已经消除了代码中的警告。我已经使用了 add_student 函数，使其接受输入并防止换行符在下一个条目之前保留在输入缓冲区中。我已经纠正了其他区域，只是为了解决编译器警告。您的代码仍然需要大量工作。这会给你一个良好的开始并消除那种不知所措的感觉(暂时)。检查你的代码，看看我所做的更正。慢点——你会做得很好。
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define SIZE 4
struct Student
{
long StudentID;//works
char fname[21];//works
char sname[21];//does not work
int year;//works
char course[51];//works
float results_semester_1[6];//works
float results_semester_2[6];//works
int free; // 1 means its free, 0 means its not
};
struct Student BENG[SIZE];
int menu(); // function prototype
void add_student(); // function prototype
void display_students(); // function prototype
void display_results(); // function prototype
void search_for_student_studentID(); // function prototype
void search_for_student_by_name(); // function prototype
void delete_student(); // function prototype
void initialise_database(); // function prototype
void Run_statistics_for_individual_student(); // function prototype
void Run_statistics_for_all_student(); // function prototype
int linear_search(long); // function prototype
int linear_search_sname(char*); // function prototype
int main()
{
initialise_database(); // call the function to set all free positions to 1
for(;;) // infinite loop
{
switch(menu()) // calling function menu within switch
{
case 1:
add_student(); // calling function add_student
break;
case 2:
delete_student(); // calling function delete_student
break;
case 3:
display_students(); // calling function display_students
break;
case 4:
search_for_student_studentID(); // calling function display_students
break;
case 5:
search_for_student_by_name(); // calling function display_students
break;
case 6:
Run_statistics_for_individual_student(); // calling function display_students
break;
case 7:
Run_statistics_for_all_student(); // calling function display_students
break;
case 8:
display_results(); // calling function display_students
break;
case 9:
printf("Quitting Program\n");
exit(1);
default:
printf("Invalid option chosen\n\n");
}
} // end of infinite loop
return 0;
}
void add_student()
{
int freepos = -1;
int i = 0;
int j = 0;
int k = 0;
for(i = 0; i < SIZE; i++)
{
if(BENG[i].free == 1)
{
freepos = i;
break;
}
}
if(freepos != -1)
{
do
{
printf("Enter student ID (8-digits): ");
scanf("%ld%*c", &BENG[freepos].StudentID);
}
while(BENG[freepos].StudentID<10000000 || BENG[freepos].StudentID>99999999);
printf("Enter firstname: ");
scanf("%[^\n]%*c", BENG[freepos].fname);
printf("Enter surname: ");
scanf("%[^\n]%*c", BENG[freepos].sname);
do
{
printf("Enter year of course (1-4): ");
scanf("%d%*c", &BENG[freepos].year);
}
while(BENG[freepos].year < 1 || BENG[freepos].year > 4);
printf("Enter course name: ");
scanf("%[^\n]%*c", BENG[freepos].course);
for(j = 0; j < 6; j++)
{
printf("Enter result of semester 1 Module %d: ", j+1);
scanf("%f%*c", &BENG[freepos].results_semester_1[j]);
}
for(k = 0; k < 6; k++)
{
printf("Enter result of semester 2 Module %d: ", k+1);
scanf("%f%*c", &BENG[freepos].results_semester_2[k]);
}
BENG[freepos].free = 0; // mark record as taken
}
else
printf("No position free at present\n");
}
void display_students()
{
// output the values just entered
int i, j;
for(i = 0; i < SIZE; i++)
{
if(BENG[i].free == 0) // only print taken records
{
printf("Student ID: %ld:\n", BENG[i].StudentID);
printf("Firstname: %s\n", BENG[i].fname);
printf("Surname: %s\n", BENG[i].sname);
printf("Year: %d\n", BENG[i].year);
printf("Course: %s\n", BENG[i].course);
for(j = 0; j < 6; j++)
{
printf("Result semester 1 Module %d: %0.2f\n", j+1, BENG[i].results_semester_1[j]);
} // end of for
for(j = 0; j < 6; j++)
{
printf("Result semester 2 Module %d: %0.2f\n", j+1, BENG[i].results_semester_2[j]);
} // end of for
} // end of if
} // end of for
}
void display_results()
{
// output the values just entered
int i, j;
for(i = 0; i < SIZE; i++)
{
if(BENG[i].free == 0) // only print taken records
{
for(j = 0; j < 6; j++)
{
printf("Result semester 1 Module %d: %0.2f\n", j+1, BENG[i].results_semester_1[j]);
} // end of for
for(j = 0; j < 6; j++)
{
printf("Result semester 2 Module %d: %0.2f\n", j+1, BENG[i].results_semester_2[j]);
} // end of for
} // end of if
} // end of for
}
int menu()
{
int choice;
printf("1. To add a student\n");
printf("2. To delete a student\n");
printf("3. To display all students\n");
printf("4. Find a student using studentID\n");
printf("5. Find a student by student Surname\n");
printf("6. Find student would you like to run statistics for\n");
printf("7. Find statistics for all students\n");
printf("8. Display results of all students\n");
printf("9. Exit Program\n");
do
{
scanf("%d", &choice);
}
while(choice < 1 || choice > 9);
return choice;
}
void initialise_database()
{
int i;
for(i = 0; i < SIZE; i++) // set all structure variables free to 1
BENG[i].free = 1;
}
void delete_student()
{
long search = 0;
int position = 0;
printf("Enter the number of student to delete\n");
scanf("%ld%*c",&search);
position = linear_search(search);
if ( position == -1 )
printf("%ld is not present in array.\n", search);
else
printf("%ld is present at location %d.\n", search, position+1);
BENG[position].free = 1;
return;
}
void search_for_student_studentID()
{
long search = 0;
int position = 0;
int j = 0;
printf ("Enter the number to search: ");
scanf ("%ld%*c",&search);
position = linear_search (search);
if ( position == -1 )
printf("%ld is not present in array.\n", search);
else
printf("%ld is present at location %d.\n", search, position+1);
printf("Student ID: %ld:\n", BENG[position].StudentID);
printf("Firstname: %s\n", BENG[position].fname);
printf("Surname: %s\n", BENG[position].sname);
printf("Year: %d\n", BENG[position].year);
printf("Course: %s\n", BENG[position].course);
for(j = 0; j < 6; j++)
{
printf("Result semester 1 Module %d: %0.2f\n", j+1, BENG[position].results_semester_1[j]);
}
for(j = 0; j < 6; j++)
{
printf("Result semester 2 Module %d: %0.2f\n", j+1, BENG[position].results_semester_2[j]);
}
return;
}
void search_for_student_by_name (char *sname)
{
int position = 0;
int j = 0;
printf("Enter the surname of student to search\n");
scanf("%[^\n]%*c", sname);
position = linear_search_sname(sname);
if ( position == 1 )
printf("%s is not present in array.\n", sname);
else
printf("%s is present at location %d.\n", sname, position+1);
printf("Student ID: %ld:\n", BENG[position].StudentID);
printf("Firstname: %s\n", BENG[position].fname);
printf("Surname: %s\n", BENG[position].sname);
printf("Year: %d\n", BENG[position].year);
printf("Course: %s\n", BENG[position].course);
for(j = 0; j < 6; j++)
{
printf("Result semester 1 Module %d: %0.2f\n", j+1, BENG[position].results_semester_1[j]);
}
for(j = 0; j < 6; j++)
{
printf("Result semester 2 Module %d: %0.2f\n", j+1, BENG[position].results_semester_2[j]);
}
return;
}
int linear_search(long find)
{
int c = 0;
for ( c = 0 ; c < SIZE ; c++ )
if (BENG[c].StudentID == find )
return c;
return -1;
}
int linear_search_sname(char *find)
{
int c = 0;
for ( c = 0 ; c < SIZE ; c++ )
if (strcmp (BENG[c].sname, find) == 0 )
return c;
return -1;
}
void Run_statistics_for_individual_student()
{
long search = 0;
int position = 0;
int i = 0;
int k = 0;
int max = 0;
int min = 100;
float sums = 0,maxsums=0;
printf("Enter the number to search\n");
scanf("%ld",&search);
printf("The statistics for student ID (%ld):\n",search);
position = linear_search(search);
if ( position == -1 )
printf("%ld is not present in array.\n", search);
else
for(i = 0; i < 6; i++)
{
sums += BENG[position].results_semester_1[i];
}
printf("Average grade over 6 subjects for this student in semester 1 is %0.2f marks\n", sums/6);
for(i = 0; i < 6; i++)
{
maxsums = BENG[position].results_semester_1[i];
}
if(maxsums>max)
{
max=maxsums;
} // end of if
printf("Max grade for this student in semester 1 is %d\n", max);
{
for(k = 0; k < 6; k++)
{
if(BENG[position].results_semester_1[k]<min)
{
min=BENG[position].results_semester_1[k];
} // end of if
}// end of for
printf("Min grade for this student in semester 2 is %d\n", min);
}
for(i = 0; i < 6; i++)
{
sums += BENG[position].results_semester_2[i];
}
printf("Average grade over 6 subjects for this student in semester 2 is %0.2f marks\n", sums/6);
for(i = 0; i < 6; i++)
{
maxsums = BENG[position].results_semester_2[i];
}
if(maxsums>max)
{
max=maxsums;
} // end of if
printf("Max grade for this student in semester 2 is %d\n", max);
{
for(k = 0; k < 6; k++)
{
if(BENG[position].results_semester_2[k]<min)
{
min=BENG[position].results_semester_2[k];
} // end of if
}// end of for
printf("Min grade for this student in semester 2 is %d\n", min);
}
return ;
}
void Run_statistics_for_all_student()
{
// output the values just entered
int i,j,k, max,min=100;
float sums,maxsums=0;
{
for(i = 0; i < SIZE; i++)
if(BENG[i].free == 0) // only print taken records
{
for(j = 0; j < 6; j++)
{
for(i = 0; i < SIZE; i++)
{
sums += BENG[i].results_semester_1[i];
} // end of for
} // end of for
} // end of if
printf("Average grade for all students in semester 1 is %0.2f \n", sums/(SIZE*6));
}
{
for(k = 0; k < SIZE; k++)
if(BENG[i].free == 0) // only print taken records
{
for(j = 0; j < 6; j++)
{
for(i = 0; i < SIZE; i++)
{
maxsums = BENG[i].results_semester_1[i];
}
if(maxsums>max)
{
max=maxsums;
}
}// end of for
}// end of if
}
printf("Max grade for all student in semester 1 is%d\n", max);
{
for(k = 0; k < SIZE; k++)
if(BENG[k].free == 0) // only print taken records
{
for(j = 0; j < 6; j++)
{
for(i = 0; i < 6; i++)
{
if(BENG[i].results_semester_1[i]<min)
{
min=BENG[i].results_semester_1[i];
}
}// end of for
}// end of for
}// end of if
}
printf("Min grade for all student in semester 1 is %d\n", min);
return ;
}
使用/输出:
./bin/student_database
1. To add a student
2. To delete a student
3. To display all students
4. Find a student using studentID
5. Find a student by student Surname
6. Find student would you like to run statistics for
7. Find statistics for all students
8. Display results of all students
9. Exit Program
1
Enter student ID (8-digits): 12345678
Enter firstname: Johnny
Enter surname: Walker
Enter year of course (1-4): 1
Enter course name: UnderwaterMusic
Enter result of semester 1 Module 1: 88.8
Enter result of semester 1 Module 2: 89.8
Enter result of semester 1 Module 3: 90.8
Enter result of semester 1 Module 4: 91.0
Enter result of semester 1 Module 5: 68.7
Enter result of semester 1 Module 6: 66.7
Enter result of semester 2 Module 1: 92.4
Enter result of semester 2 Module 2: 88.4
Enter result of semester 2 Module 3: 82.3
Enter result of semester 2 Module 4: 95.3
Enter result of semester 2 Module 5: 91.2
Enter result of semester 2 Module 6: 88.5
1. To add a student
2. To delete a student
3. To display all students
4. Find a student using studentID
5. Find a student by student Surname
6. Find student would you like to run statistics for
7. Find statistics for all students
8. Display results of all students
9. Exit Program
3
Student ID: 12345678:
Firstname: Johnny
Surname: Walker
Year: 1
Course: UnderwaterMusic
Result semester 1 Module 1: 88.80
Result semester 1 Module 2: 89.80
Result semester 1 Module 3: 90.80
Result semester 1 Module 4: 91.00
Result semester 1 Module 5: 68.70
Result semester 1 Module 6: 66.70
Result semester 2 Module 1: 92.40
Result semester 2 Module 2: 88.40
Result semester 2 Module 3: 82.30
Result semester 2 Module 4: 95.30
Result semester 2 Module 5: 91.20
Result semester 2 Module 6: 88.50
1. To add a student
2. To delete a student
3. To display all students
4. Find a student using studentID
5. Find a student by student Surname
6. Find student would you like to run statistics for
7. Find statistics for all students
8. Display results of all students
9. Exit Program
9
Quitting Program
其他建议
我给您的一个建议是不要在函数中静态声明字符串大小，而只需在 add_student 函数中根据需要进行分配。例如:
struct Student
{
long StudentID;//works
char *fname;//works
char *sname;//does not work
int year;//works
char *course;//works
float results_semester_1[6];//works
float results_semester_2[6];//works
int free; // 1 means its free, 0 means its not
};
然后您可以简单地允许 scanf 根据需要动态分配内存，例如:
scanf("%m[^\n]%*c", &BENG[freepos].fname);
此外，您会看到我必须更改 add_student 中的所有 scanf 格式字符串，以防止 newline 保留在输入缓冲区中(按 [enter] 的结果)导致程序跳过下一个输入。控制输入缓冲区的状态至关重要。有很多方法可以做到这一点，但仔细看看 man scanf 是一个很好的起点。
关于c - 请帮助真正陷入结构困境，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27324819/
25
4
0
我有这个问题: 我们声称对 float 使用相等测试是不安全的，因为算术运算会引入舍入错误，这意味着两个应该相等的数字实际上并不相等。 对于这个程序，您应该选择一个数字 N，并编写一个程序来显示 1
为什么这个脚本的输出是 5 而不是 8 ？ 我认为 -- 意味着 -1 两次。 var x = 0; var y = 10; while ( x
我现在可以从 cmd 窗口中执行的 FFmpeg 过程中读取最后一行。 使用脚本主机模型对象引用此源。 Private Sub Command1_Click() Dim oExec
使用 vlookup，当匹配发生时，我想从匹配发生的同一行显示工作表 2 中 C 列的值。我想出的公式从 C 列表 2 中获取值，但它从公式粘贴在表 3 上的行中获取，而不是从匹配发生的位置获取。 这
我在破译 WCF 跟踪文件时遇到了问题，我希望有人能帮助我确定管道中的哪个位置发生了延迟。 “Processing Message XX”的跟踪如下所示，在事件边界和传输到“Process Actio
我有四个表，USER、CONTACT、CONACT_TYPE 和 USER_CONTACT USER_CONTACT 存储用户具有填充虚拟数据的表的所有联系人如下 用户表 USER_ID(int)|
以下有什么作用？ public static function find_by_sql($sql="") { global $database; $result_set = $data
我正在解决 JavaBat 问题并且对我的逻辑感到困惑。 这是任务: Given a day of the week encoded as 0=Sun, 1=Mon, 2=Tue, ...6=Sat,
我正在研究一些 Scala 代码，发现这种方法让我感到困惑。在匹配语句中，sublist@ 是什么？构造？它包含什么样的值(value)？当我打印它时，它与 tail 没有区别，但如果我用尾部替换它，
我正在使用以下代码自行缩放图像。代码很好，图像缩放也没有问题。 UIImage *originImg = img; size = newSize; if (originImg.size.width >
Instruments 无法在我的 iPad 和 iPhone 上启动。两者都已正确配置，我可以毫无问题地从 xcode 调试它们上的代码，但 Instruments 无法启动。 我听到的只是一声嘟嘟
我想用 iPhone 的 NSRegularExpression 类解析此文本: Uploaded652.81 GB 用于摘录上传和652.81文本。 最佳答案 虽然我确实认为 xml 解析器更适合解
我找到了 solution在 Stackoverflow 上，根据过滤器显示 HTML“li”元素(请参阅附件)。本质上基于 HTML 元素中定义的 css 类，它填充您可以从中选择的下拉列表。 我想
这是一个简单的问题，但我是在 SQL 2005 中形成 XML 的新手，但是用于形成如下所示表中的 XML 的最佳 FOR XML SQL 语句是什么？ Column1 Column2 -
我在 www.enigmafest.com 有一个网站!您可以尝试打开它!我面临的问题是，在预加载器完成后，主页会出现，但其他菜单仍然需要很长时间才能加载，而且声音也至少需要 5 分钟! :( 我怎样
好吧，我正在尝试用 Haskell 来理解 IO，我想我应该编写一个处理网页的简短小应用程序来完成它。我被绊倒的代码片段是(向 bobince 表示歉意，但公平地说，我并不想在这里解析 HTML，只是
如何使用背景页面来突出显示网站上的某个关键字，无论网站是什么(谷歌浏览器扩展)？没有弹出窗口或任何东西，它只是在某人正在查看的网站上编辑关键字。我以前见过这样的，就是不明白怎么做!谢谢你的帮助。 最佳
我是 Javascript 新手，需要一些帮助。 先看图片: . 积分预测器应用程序。 基本上当用户通过单选按钮选择获胜团队时它应该在积分栏中为获胜队添加 10 分，并且并根据得分高的球队自动对表格进
这是我的情况 - 我要发送一份时事通讯，我试图做的是，当用户单击电子邮件中的链接时，它会重定向到我的网页，然后会弹出一个灯箱，显示视频。我无法在页面加载时触发灯箱，因为您可以在查看灯箱之前转到同一页面
我有这个代码。 ¿Cuanto es ? Ir 我想获取用户输入的“验证码”值。我尝试这个但行不通。有什么帮助吗？ var campo = d
我是一名优秀的程序员,十分优秀！