#include <iostream>
//#include<stdio.h>
// cstdio library and stdio.h header file
#include<string.h>
using namespace std;
//char_append_strncat1.cpp
int main()
{
	char str1[12] = "Hello World";
	//unsigned int n1 = str1.size();
	char ch1[13]; // defined the length of an array
	for(int i = 0; i <12 ; i++)
	{
	strcpy(ch1, "");
    strncat(ch1,str1,i);
	//strcat(ch1,str1);//will print complete char sequence
	puts(ch1);

	}
	return 0;
}