计算入门之加减乘除 求c++解法

#include <iostream>
using namespace std;
int main()
{
    int a,b;
    cin >>a >> b;
    cout << a << " + " << b << " = " << a+b << endl;
    cout << a << " - " << b << " = " << a-b << endl;
    cout << a << " * " << b << " = " << a*b << endl;
    if(a%b == 0)
        cout << a << " / " << b << " = " << a/b << endl;
    else
        cout << a << " / " << b << " = " << (double)a/b << endl;
    return 0;
}

int main() 
{
    float a,b;
    std::cin >> a>>b;
    std::cout <<"[" << a << "]" <<" + " <<"[" <<b << "] = [" << a+b << "]"<<endl;
    std::cout <<"[" << a << "]" <<" - " <<"[" <<b << "] = [" << a-b << "]"<<endl;
    std::cout <<"[" << a << "]" <<" * " <<"[" <<b << "] = [" << a*b << "]"<<endl;
    std::cout <<"[" << a << "]" <<" / " <<"[" <<b << "] = [" << a/b << "]"<<endl;

}