c - 将每个变量打印到文件中

Question

下午好。我正在打印到文件，但遇到了一些问题。首先，程序从文件中读取内容，将内容存储在变量中，然后使用一些附加信息打印到另一个文件。然而问题是，它只将第一个文件中最后一个人的信息打印到新文件中。如果有人能够解决这个问题，我将非常感激。下面是代码片段

#include <stdio.h>
#include <conio.h>
#include <errno.h>

int idArray[100];
int AmtArray; //stores the number of ID's in array

int Stud_List();
//FUNCTION TO PRINT STUDENT'S LIST
int Stud_List(){    
    //DECLARATION OF VARIABLES
    FILE *kfile;
    char ffname[28];
    char flname[28];
    int fID;
    int x; //counts amount of entries within file

    //INITIALIZATION OF VARIABLES
    x = 0; 

    if ((kfile = fopen("information.txt", "r")) == NULL)
    {
        //this to be displayed if file path is incorrect or file cannot be found.
        fprintf(stderr, "Error while opening file (%d: %s)\n", errno, strerror(errno)); 
        return 0;
    }

    while (!feof(kfile)){

        fscanf(kfile, "%s %s %d", ffname, flname, &fID); //reads the contents of the file
        printf("\n\n%s - %s - %d", ffname ,flname, fID);
        idArray[x] = fID;
        x++;
    }
    AmtArray = x;
}

int Stats( char *, int);
int Stats (*status, int id){ 

    FILE *Register;

    Register = fopen ("update.txt","w");
    fprintf( Register, "%5d%8s", id, status);

    fclose(Register);
    }

int main (void){
    int IDentry;
    int x, y; //counters in ID check
    printf("            ========Attendance Recording System========\n");
    printf("                              Menu\n");

    Stud_List(); //call to the function to print the list of the students

    printf("\n\n");
    for (x = 0; x < AmtArray; x++){

        printf("Please enter ID for absent student: ");
        scanf("%4d[0123456789]", &IDentry);

        if (IDentry == idArray[x]){
            Stats ("Absent", idArray[x]);
        }
        if (IDentry == idArray[x]){
            Stats ("Absent", idArray[x]);
        }
    }
getch();
return 0;   
}

Answer 1

Register = fopen ("update.txt","w");

每次打开文件时都会清除该文件。第二个参数应更改为 "a"，以便每次调用 Stats() 都会附加到文件末尾。