Length of String without using strlen

#include <stdio.h>
#include<conio.h>
int main()
{ char s[100],i;
clrscr();
printf("\n\n program to calculate length of string without strlen");
printf("\n Enter a string: ");
scanf("%s",s);
for(i=0; s[i]!='\0'; i++);
printf("\n Length of string: %d",i);
getch();
}