use
char * strchr ( const char *, int );
consider the example below.
#include <stdio.h>
#include <string.h>
int main ()
{
char str[] = "This is a sample string";
char * pch;
printf ( "Looking for the 's'character in \"%s\"...\n", str );
pch = strchr(str,'s' );
while ( pch != NULL )
{
printf ( "found at %d\n", pch - str + 1 );
pch = strchr( pch + 1, 's' );
}
return 0;
}</string.h></stdio.h>