51.從鍵盤上輸入任意兩個數和一個運算子（+、-、*、/），根據輸入的運算子對兩個數計算，並輸出結果

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?#include<iostream>using namespace std;int main(){    int x,y;    char a;    cout<<"please input two numbers: "<<endl;    cin>>x>>y;    cout<<"please input an operational character:"<<endl;    cin>>a;    switch(a)//switch函數的參數還可用字元    {        case ‘+‘: cout<<"x+y="<<x+y;break;        case ‘-‘: cout<<"x-y="<<x-y;break;        case ‘*‘: cout<<"x*y="<<x*y;break;        case ‘/‘: cout<<"x/y="<<x/y;break;        default : break;    }    return 0;}