#include <stdio.h>
#include<string.h>
int main() {
    char str[100]="M i a";
    char *ptr;
    int length;
    int i=0;
    ptr=str;
    while(str[i]!='\0'){
        length++;
        i++;
    }
    printf("String length : %d",length);
    return 0;
}