Gcc error: 'NULL' and 'stderr' undeclared

0
votes

I'm using gcc 4.6.0 for armv7. Today I needed to compile this source:

#include <sys/types.h>
#include <dirent.h>
int main(void)
{
    DIR *dir = opendir(".");
    if(dir)
    {
        struct dirent *ent;
        while ((ent = readdir(dir)) != NULL)
        {
            puts(ent->d_name);
        }
    }
    else
    {
        fprintf(stderr, "Error opening directory\n");
    }
    return 0;
}

At compilation there were here such errors:

test.c: In function 'main': test.c:10:31: error: 'NULL' undeclared (first use in this function) test.c:10:31: note: each undeclared identifier is reported only once for each function it appears in test.c:17:1: warning: incompatible implicit declaration of built-in function 'fprintf' [enabled by default] test.c:17:9: error: 'stderr' undeclared (first use in this function)

How can I fix this?

1
gcc

1 Answers

1
votes

Add the following include:

#include <stdio.h>