嵌套循环程序设计
7-1计算阶乘和
#include<stdio.h>int f(int a){int sum = 1;for(int i=1;i<=a;i++){sum *= i;}return sum;}//构造N！函数int main(){int N = 0,sum = 0;//初始化scanf("%d",&N);if(N>1){for(int i=1;i<=N;i++){sum += f(i);//实现N！+...+1！}printf("%d",sum);}else{printf("1");//N==1就没有必要用函数和循环。}return 0;}
