C++： 计算星期几

解题思路:   利用数组存放星期几，较少代码重复量

注意事项:   注意每次都要循环都要进行%取余运算，不然会造成越界

参考代码:   

                #include<iostream>

                using namespace std;

                int main()

                {

                 string arr[7] = { "Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday" };

                 int sum = 1;

                 int a, b;

                 cin >> a >> b;

                 for (int i = 0; i < b; ++i) {

                 sum *= a;

                 sum %= 7;

                 }

                 cout << arr[sum] << endl;

                 system("pause");

                 return 0;

                }