Question

编写一个程序，采用递推法，计算并输出1*2*3+3*4*5+·····+99*100*101

Answer 1

#include<stdio.h>
int main()
{
int iSum = 0;
for (int i = 1; i <= 99; ++i)
iSum += i * (i + 1) * (i + 2);
printf("1*2*3+3*4*5+·····+99*100*101 = %d\n", iSum);
return 0;
}