a = int(input("nhập a"))
b = int(input("nhập b"))
if (a + b):
    print("a + b=", a + b)
elif (a - b):
    print("a - b=", a - b)
elif (a * b):
    print("a * b=", a * b)
elif (a / b):
    print("a / b", a / b)

#include <iostream>

using namespace std;

int main()
{
    float a,b,s;
    cout << "nhap a: ";
    cin >> a;
    cout << "nhap b: ";
    cin >> b;
    char pheptoan{};
    cout << "nhap phep toan: ";
    cin >> pheptoan;
    if (static_cast<int>(pheptoan)==43){
        s = a+b;
        cout << "a+b = " << s << endl;
    }
    if (static_cast<int>(pheptoan)==42){
        s = a*b;
        cout << "a*b = " << s << endl;
    }
    if (static_cast<int>(pheptoan)==45){
        s = a-b;
        cout << "a-b = " << s << endl;
    }
    if (static_cast<int>(pheptoan)==47){
        s = a/b;
        cout << "a/b = " << s << endl;
    }
    return 0;
}