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This is a discussion on Quick Question within the C++ Programming forums, part of the General Programming Boards category; So I'm programming another calculator, and this time I'm trying to do exponents (ex. 3^4=81). Code: #include <iostream> using namespace ...

  1. #1
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    Question Quick Question

    So I'm programming another calculator, and this time I'm trying to do exponents (ex. 3^4=81).
    Code:
    #include <iostream>
    using namespace std;
    int main ()
    {
        int w=1;
        do {
            cout << "\nEnter an expression.\n"; //instructions for the user
            cout << "Key: \n";
            cout << "* = multiply\n";
            cout << "/ = divide\n";
            cout << "+ = add\n";
            cout << "- = subtract\n";
            cout << "^ = x to the yth power\n";
            cout << "Enter your expression.\n";
            int x,z;
            char y;
            cin >> x >> y >> z; //get the expression
            switch (y) {
            case '+': //calculate answer(s)
                cout << "The answer is " << x+z << ".\n";
                break;
            case '-':
                cout << "The answer is " << x-z << ".\n";
                break;
            case '*':
                cout << "The answer is " << x*z << ".\n";
                break;
            case '/':
                cout << "The answer is " << x/z << ".\n";
            case '^':
                for (z; z >= 2; z=z-1)
                {
                    int Q;
                    Q=x*x;
                }
                cout << "The answer is " << x << ".\n";
                break;
            default :
                cout << "The expression is invalid.\n";
                break;
            }
            cout << "To run function again, press 1.  Otherwise, press 0.\n"; //Optional Continuation
            cin >> w;
        } while (w==1);
        cin.get();
    }
    This program runs fine, but when I try to do the exponent, I get the wrong number. Usually it happens like this:
    3^4 = 3
    6^2 = 6
    etc.
    So basically I just get my x value back. How do I fix this?
    Thanks

  2. #2
    C++ Witch laserlight's Avatar
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    Notice that you don't change x in that part of the program, so the value of x remains the same.
    Elysia likes this.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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