Question

input.c file:

#include "input.h"
void file_processing( FILE *course_file, FILE *student_file )
{
    char buf[256], line[256];
    ........
}

input.h file:

#ifndef STUDENT_H
#define STUDENT_H

#include <string.h>

void process_command( char command[256] );

void file_processing( FILE *course_file, FILE *student_file );

#endif

main.c file:

#include "input.h"

int main( int argc, char *argv[] ){
    .........
    file_processing(course_file, student_file);
    ...
    return 0;
}

The compiler is throwing me this error:

main.c: In function ‘int main(int, char**)’:
main.c:53:46: error: ‘file_processing’ was not declared in this scope

Anyone can give me some hints on what to look at?

UPDATE:
After some extra coding, I’m getting a different error.

/tmp/ccJ4nsnm.o: In function `main':
main.c:(.text+0x1e5): undefined reference to `file_processing(_IO_FILE*, _IO_FILE*)'
collect2: ld returned 1 exit status

Answer 1

I find it interesting that your multiple inclusion protection does not match your file name:

#ifndef STUDENT_H
#define STUDENT_H

Did you get that from another .h file that’s also being included?