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我最近正在使用文件处理在 C++ 中制作简单的问答游戏。到目前为止,我编写了以下代码。
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main()
{
int choice;
cout<<"-------------Welcome to C++ quiz game-------------\n";
cout<<"Enter your choice\n";
cout<<"1. Easy\n";
cout<<"2. Medium\n";
cout<<"3. Hard\n";
cin>>choice;
while((choice!=1) && (choice!=2) && (choice!=3))
{
cout<<"Enter choice(1 or 2 or 3) only\n";
cin>>choice;
}
if(choice==1)
{
ofstream fout("easy.txt");
string s[15];
s[0]="Which is the smallest individual unit in a C++ program?\n";
s[1]="Which of the following is the C++ style comment?";
s[2]="Who is known as father of C++?\n";
s[3]="If default arguments are provided to a constructor function then it becomes what?\n";
s[4]="In C++ arguments by default are passed by what?\n";
s[5]="By default class members are of which access specifier in C++?\n";
s[6]="gets() function prototype is available in which header?\n";
s[7]="The operator ?: is called?\n";
s[8]="atoi() function prototype is available in which header?\n";
s[9]="The constans defined using enum keyword are called?\n";
s[10]="Which of the following keyword forces the next iteration of the loop to take place?\n";
s[11]="In C++ the statements are enclosed within what?\n";
s[12]="What happens if you attempt to modify string literal?\n";
s[13]="y=x=2; in C++ will result in?\n";
s[14]="Which is the statement terminator in C++?\n";
for(int i=0;i<15;i++)
fout<<s[i]<<'\n';
fout.close();
}
else if(choice==2)
{
ofstream fout("medium.txt");
string s[15];
s[0]="Which keyword is used to retain value of local variables?\n";
s[1]="Which keyword can be applied to local variabes only?\n";
s[2]="Which keyword is used to define a new name for existing type?\n";
s[3]="What provides value for a variable?\n";
s[4]="C++ is which type of programming language?\n";
s[5]="Which operator is used to deallocate dynamically allocated memory in C++?\n";
s[6]="Is it true that = operator has same precedence as conditional operator in C++?\n";
s[7]="Which operator can't be overloaded in C++?\n";
s[8]="Which feature is used to achieve compile time polymorphism in C++?\n";
s[9]="What is wrong with the following statement float s_interest (float principal, int rate=0.25, int time);?\n";
s[10]="When a member function of class calls another member function then it is?\n";
s[11]="Which operator must be used when member function is defined outside the class?\n";
s[12]="Information is made sharable through?\n";
s[13]="Which keyword is request to the compiler?\n";
s[14]="Which is used to reduce/eliminate the function call overhead in C++?\n";
for(int i=0;i<15;i++)
fout<<s[i]<<'\n';
fout.close();
}
else if(choice==3)
{
ofstream fout("hard.txt");
string s[15];
s[0]="In which year C++ is invented?\n";
s[1]="How many types of inheritance is there in C++?\n";
s[2]="Which keyword is used to create generic function & classes in C++?\n";
s[3]="Which type of exception is thrown when new operator fails to allocate memory?\n";
s[4]="When copy constructor is called?\n";
s[5]="Which of the following regarding constructor function is false?\n";
s[6]="Which of the following statements regarding constructor is false?\n";
s[7]="Which is the latest C++ standard recently running?\n";
s[8]="The binding of a function call at runtime is?\n";
s[9]="How many keywords are there currently in C++?\n";
s[10]="The process of giving special meaning to an operator is?\n";
s[11]="Which operator should be overloaded to perform boundary checks on array?\n";
s[12]="Which of the following operators cannot be overloaded?\n";
s[13]="The symbol **\n";
s[14]="A unary operator when overloaded takes?\n";
for(int i=0;i<15;i++)
fout<<s[i]<<'\n';
fout.close();
}
return 0;
}
第二个文件:
#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
using namespace std;
string answer;
void validate();
int main()
{
int choice;
int points=0;
string s[15];
string easy[15]={"c","a","b","a","b","c","d","c","a","b","b","c","c","c","a"};
cout<<"-------------Welcome to C++ quiz game-------------\n";
cout<<"Enter your choice\n";
cout<<"1. Easy\n";
cout<<"2. Medium\n";
cout<<"3. Hard\n";
cin>>choice;
while((choice!=1) && (choice!=2) && (choice!=3))
{
cout<<"Enter choice(1 or 2 or 3) only\n";
cin>>choice;
}
if(choice==1)
{
ifstream fin("easy.txt");
if(!fin)
{
cout<<"Cannot open file\n";
exit(1);
}
cout<<"The first question is\n";
getline(fin,s[0]);
cout<<s[0]<<'\n';
cout<<"Your options are\n";
cout<<"a. Keyword\tb.Identifier\n";
cout<<"c. Token\td.None of the above\n";
cout<<"Select your answer: ";
cin>>answer;
while((answer!="a") && (answer!="b") && (answer!="c") && (answer!="d"))
{
cout<<"Select answer(a or b or c or d) only\n";
cin>>answer;
}
if(answer==easy[0])
{
cout<<"Congratulations your answer is right\n";
points+=5;
cout<<"Your points are: "<<points<<'\n';
}
else
{
cout<<"Sorry Incorrect answer. Have a good luck next time\n";
cout<<"Quiz has been Finished\n";
exit(0);
}
cout<<"The second question is\n";
**getline(fin,s[1]);
cout<<s[1]<<'\n';**
cout<<"Your options are\n";
cout<<"a. //\tb./*..*/\n";
cout<<"c. _\td.None of the above\n";
cout<<"Select your answer: ";
cin>>answer;
validate();
if(answer==easy[1])
{
cout<<"Congratulations your answer is right\n";
points+=5;
cout<<"Your points are: "<<points<<'\n';
}
else
{
cout<<"Sorry Incorrect answer. Have a good luck next time\n";
cout<<"Quiz has been Finished\n";
exit(0);
}
}
}
void validate()
{
while((answer!="a") && (answer!="b") && (answer!="c") && (answer!="d"))
{
cout<<"Select answer(a or b or c or d) only\n";
cin>>answer;
}
}
但是当我根据第一个文件中选择的游戏级别运行第二个程序文件时。这是我得到的结果。
为什么没有打印第二个问题?我缺少什么?请帮我。我的意思是为什么问题“以下哪一项是 C++ 风格的注释?” 没有被打印出来?我的代码有什么问题。我认为在第二个文件中显示为粗体的语句似乎被跳过了。
非常感谢您的帮助。
谢谢
最佳答案
几个问题:
“easy.txt”
中的问题集的第二个问题中缺少换行符。
您在输出中引入了不必要的换行符。 “easy.txt”
的第二行是一个空白样的。当您使用 getline
读回文本时,您会得到一个空行。
有两种方法可以解决这个问题:
选项 1
换行
for(int i=0;i<15;i++)
fout<<s[i]<<'\n';
到
for(int i=0;i<15;i++)
fout<<s[i];
选项 2
从问题中删除换行符。
关于c++ - 这个 C++ 程序出了什么问题?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29435575/
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