计算器小程序

#include<iostream>#include<stdio.h>using std::cout;using std::cin;using std::endl;void main(){ cout<<"1.addition"<<endl;cout<<"2.subtraction"<<endl;cout<<"3.multiplication"<<endl;cout<<"4.division"<<endl;cout<<"5.exit"<<endl;while(1){cout<<"please choose what you want to calcute method"<<endl;int option;cin>>option;if(option==1){int a,b,sum;cout<<"The first number:"<<endl;cin>>a;cout<<"The second number:"<<endl;cin>>b;sum=a+b;cout<<a<<"+"<<b<<"="<<sum<<endl;}if(option==2){int a,b,sum;cout<<"The first number:"<<endl;cin>>a;cout<<"The second number:"<<endl;cin>>b;sum=a-b;cout<<a<<"-"<<b<<"="<<sum<<endl;}if(option==3){int a,b,sum;cout<<"The first number:"<<endl;cin>>a;cout<<"The second number:"<<endl;cin>>b;sum=a*b;cout<<a<<"*"<<b<<"="<<sum<<endl;}if(option==4){int a,b,sum;cout<<"The first number:"<<endl;cin>>a;cout<<"The second number:"<<endl;cin>>b;sum=a/b;cout<<a<<"/"<<b<<"="<<sum<<endl;}if(option==5)   exit(1);}