strchr trouble

Hi all!

This code should work, but it doesn't:

Code:

---

#include <stdio.h>

int main(void)
{
        char *pos;
        char buf[100];
        FILE *fp;
                fp = fopen("text.txt","r");
       
                fgets(buf, 100, fp);
                pos = strchr(buf, '~');
                if (pos){
                        printf("Character '~' found at position %d.\n", pos - buf);
                }
 

        fclose(fp);
    return 0;

}

---

When I try to compile it I get this:
warning: incompatible implicit declaration of built-in function 'strchr'.

What's wrong with the code?

Thanks in advance for help

Perhaps...

Code:

---

#include <string.h>

---

Have you included string.h header?

hurray :) The string header worked

Thanks