C-Program to know the length of a string without using string functions

#include<stdio.h>

int main()

{

 char str[100];

 int i,len=0;

 printf("Enter a string to know the length\n");

 scanf("%s",&str);

 for(i=0;str[i]!='\0';i++)

 {

  len++;

 }

 printf("The length of %s is %d\n",str,len);

return 0;

}