#include <stdio.h>

int strlen(char str[])
{
 int i=0;

 while (str[i]!='\0')
 {
  i=i+1;
 }

 return i;
}

int main(void)
{
 char s[256]="salut";

 printf("strlen(%s)=%d\n",s,strlen(s));

 return 0;
}