跪求高手编写简易计算器程序，输入格式：data1 op date2!!!!

我现在电脑上没装C++，这是在记事本里写的，我不是高手，不知有没有错误
#include <iostream>
using namespace std;

int main()
{
double data1,data2; char op;
cout<<"Input:";
cin>>data1>>op>>data2;
if (op=='+')
{cout<<"Result:"<<data1+data2;}
if (op=='-')
{cout<<"Result:"<<data1-data2;}
if (op=='*')
{cout<<"Result:"<<data1*data2;}
if (op=='/')
{
if (data2!=0)
cout<<"Result:"<<data1/data2;
else cout<<"Error.";
}
return 1;
}