#include<stdio.h>

int func_sum(int n)
{
	int sum = 0, i;
	for( i = 0; i <= n; i++ )
	{
		sum += i;
	}
	return sum;
}

int main()
{
	int i;
	int sum_result = 0;
	sum_result = func_sum(100);
	printf("\nThe sum of 1~100 is %d\n", sum_result);
	
	sum_result = func_sum(200);
	printf("The sum of 1~200 is %d\n\n", sum_result);
	
	return 0;
}