//Although There Are predefined Function for String But one Must Know what is the working
#include<stdio.h>
int main()	{
	char string[40],loop;
	int loop,size;
	gets(str);
	for(loop=0; loop<40; loop++)
		{
		if(str[loop]=='\0')
			break;
		else
			size=size+1;// alternativerly size++
		}
	printf("size is %d",size);
	}