here is my code to find out the length of the string.

include <stdio.h>

include <stdlib.h>

int main()
{
char st[ ]="hithere";
printf("\a");
int i;
i=len(st);
printf("%s",st);
printf("\a%d",i);
return 0;
}
int len(char s)
{
int l=0;
while(s != '\0');
{

 l++;        
 s++;

}

return (l);
}

cant figure out the problem please help. (making in codeblocks)