file I/O, writing to the file.

[programinproces]

I have to write user given data to a .txt file. I did with fprintf but only string did not write in the file? here is my code.

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>


int main()
{
    struct student {                // student record field
        int st_id;
        char st_name[20];
        int st_age;
        char st_dep[6];
        float st_grade;
    }line;
    char name[20];
    printf("Please Enter 6 digit student ID\n");
    scanf("%d",&line.st_id);
    printf("please Enter student name\n");
    scanf("%s",name);
    printf("%s",name);
    printf("Please Enter student age\n");
    scanf("%d", &line.st_age);
    printf("Please Enter student Department(MATHS,CHEM,CSE,BME)\n");
    scanf("%s",&line.st_dep[6]);
    printf("Please Enter student grade(0-100)\n");
    scanf("%f",&line.st_grade);
    FILE * fp;                                                          // file open from here.
    if ((fp = fopen ("file.txt", "a")) != NULL){
        printf("%s",line.st_name);
        fprintf(fp, "%d, %s, %d, %s,%f \n", line.st_id, line.st_name, line.st_age,line.st_dep,line.st_grade);
        fclose(fp);
        printf("data recorded\n");
    }
    else printf("Writing Error.\n");
    return 0;
}

file.txt file is here
111111, , 23232, ,33.000000 // here string is missing?

[vart]

you never fill line.st_name - instead you fill local var name. Why?

[programinproces]

I try that but it was error then I went this way. Is it shouldn't be this way?

[programinproces]

Thanks vart This time it works. I don't know where I was lost

[vart]

you should also fix your line 25 - it access the array out of bounds

It should be

scanf("%5s",line.st_dep);

same goes for reading name - %s without width specifier in scanf is really dangerous and is one of the security wholes exploitable by hackers. Width in %s should be one less than array length

[programinproces]

Thanks and great appreciation.

You can't live a perfect day without doing something for someone who will never be able to repay you. ~John Wooden