C++第4次作业

项目3：乘法口诀表

#include<iostream>  using namespace std;int main(){int i, j, k;for (i = 1; i <= 9; i++){for (j = 1; j <= i; j++){k = j*i;cout << j << "x" << i << "=" << k << "\t ";}cout << endl;}return 0;}

项目4：输出完数

#include<iostream>  using namespace std;int main(){int i, j, k;cout << "1000以内的完数有：";for (i = 2; i <= 1000; i++){k = 0;for (j = 1; j <= i / 2; j++){if (i%j == 0)k = k + j;}if (k==i)cout << k << "\t ";}return 0;}

项目7：百钱百鸡

#include<iostream>  using namespace std;int main(){int x, y, z, count = 0;for (x = 0; x <= 20; x++)    for (y = 0; y <= 33; y++)    for (z = 1; z <= 100; z++)if (x + y + z == 100 && 5 * x + 3 * y + z / 3 == 100 && z % 3 == 0){count++;cout << count << ".鸡翁" << x << "只，鸡母" << y << "只，鸡雏" << z << "只" << endl;}return 0;}