Help! My calculator doesn’t work properly!

[Minionmin]

I keep getting “Invalidate operator. Try again”. What did I do wrong?

  #include <iostream> 

using namespace std;

int main(){
    char opr;
    do{
        int a,b,z;
        cin >> opr;
        if(opr = '+' || '-' || '*' || '/' || '%'){
            cin >> a >> b;
            switch(opr){
            case '+':
            z = a + b;
            cout << z << endl;
            break;
            case '-':
            z = a - b;
            cout << z << endl;
            break;
            case '*':
            z = a * b;
            cout << z << endl;
            break;
            case '/':
            z = a / b;
            cout << z << endl;
            break;
            case '%':
            z = a % b;
            cout << z << endl;
            break;
            default:
            cout << "Invalid operation. Try again." << endl;}
        }
    }while(opr != 'x' || opr != 'X')
}

[salem c]

> if(opr = '+' || '-' || '*' || '/' || '%')
This isn't how you do it.

> while(opr != 'x' || opr != 'X')
This is how you do it.

So use == to compare, and compare each one in turn.

[Minionmin]

I fixed it just now! Thank you so much!