计算N的阶乘
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
int i;
int n;
int sum = 1;
scanf(“%d\n”,&n);
for (i = 1; i <= n; i++)
{
sum = sum*i;
}
printf(“%d\n”, sum);
return 0;
}
前N 项阶乘之和
#include<stdio.h>
int main()
{
int i;
int j;
int sum=0;
for (int j = 1; j <=5;j++)
{
int a=1;
for (i = 1; i <= j; i++)
{
a*=i;
}
sum += a;
}
printf(“%d\n”, sum);
return 0;
}