Question

I am making a quiz program in c for a school project.I was storing question and answers in a text file.The text file contains 1 question and followed by 4 choices and a correct answer(each in a new line) and so on.The code for file handling is

#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<process.h>
void main()
{
int tnum=2,mnum;
printf("Enter a file name to load the quiz from or enter dhruv.txt to load the default file\n");
printf("(For type of file and arrangement of data in it, refer to the documentation\n");
printf("WARNING: An improper quiz file may result in malfunctioning of the program.\n");
char quizfile[100];
scanf("%s",quizfile);
FILE *dj;
dj = fopen(quizfile,"r");
int test = 1;
while(dj == NULL)
{
    printf("Requested file does not exist.Please enter a valid name\n");
    scanf("%s",quizfile);
    dj = fopen(quizfile,"r");
    test++;
    if(test == 5)
    {
    exit(0);
    }
}
char line[500];
char ques[20][500],ansa[20][500],ansb[20][500],ansc[20][500],ansd[20][500],anse[20][500];
int start = 1,quesval=1,ans1=1,ans2=1,ans3=1,ans4=1,ans5=1;
while(fgets(line,sizeof line,dj) != NULL)
{
    if((start%6) == 1)
    {
        strcpy(ques[quesval],line);
        quesval++;
    }
    if((start%6) == 2)
    {
        strcpy(ansa[ans1],line);
        ans1++;
    }
    if((start%6) == 3)
    {
        strcpy(ansb[ans2],line);
        ans2++;
    }
    if((start%6) == 4)
    {
        strcpy(ansc[ans3],line);
        ans3++;
    }

    if((start%6) == 0)
    {
        strcpy(anse[ans5],line);
        ans5++;
    }

    if((start%6) == 5)
    {
        strcpy(ansd[ans4],line);
        ans4++;
    }

    start++;

}
fclose(dj);
printf("Quiz file successfully loaded\n");
printf("/t/t WELCOME TO THE QUIZ\n\n");
printf("Every team must select one of the four correct answers to the asked questions to gain points\n");
printf("Wrong answer will not be penalized\n");
for(int k =1;k<quesval;k++)
{
    int myvar;
    myvar = k%tnum;
    if(myvar == 0)
    {
        myvar = tnum;
    }
    printf("Question for TEAM %d\n\n",myvar);
    printf("%s \n A.%s B.%s C.%s D.%s\n",ques[k],ansa[k],ansb[k],ansc[k],ansd[k]);
}
getch();
}

The problem is

        if((start%6) == 0)
    {
        strcpy(anse[ans5],line);
        ans5++;
    }

The program shows File does not exist if i use this but as soon as i comment it out the program works fine.I don’t know what the error is.Please do help

EDIT:My text file looks like:

Who is the owner
dhruv
jain
kalio
polika
dhruv
who is his friend
sarika
katrina
jen
aarushi
aarushi
where is he
home
office
college
toilet
office
where will he go
home
office
college
toilet
home

EDIT
I am using Turbo c++ in windows 7 using DOSBOX..The script is updated above

Answer 1

It’s difficult to say without seeing your input file, but I suspect that your array declarations are backwards. For example, you have:

 char ques[500][20];

This declares an array of 500 elements, where each element can be up to 20 characters. You probably want:

 char ques[20][500];

This declares an array of 20 elements, where each element can be up to 500 characters.

If your input file contains lines longer than 20 characters, then your current code is likely overwriting your arrays.