08/12/16 21:14:50
>>8 /* 酔っ払ってるから(ry *\
#include <stdio.h>
#include <stdlib.h>
#define SIZE 256
int main(void)
{
char buff[SIZE];
int N, sum = 0, i;
printf("N = "); N = atoi(fgets(buff, SIZE, stdin));
for (i = 1; i <= N; ++i) sum += i * i;
printf("1 x 1 + 2 x 2 + ... + %d x %d = %d\n", N, N, sum);
return 0;
}