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Q: C++ ( Answered,   0 Comments )
Subject: C++
Category: Reference, Education and News
Asked by: november25-ga
List Price: $20.00
Posted: 09 Dec 2002 08:09 PST
Expires: 08 Jan 2003 08:09 PST
Question ID: 121816
Writing a C++ program that mimics a calculator.  The program should
take as input two integers and the operation to be performed.  It
should then output the numbers, the operator, and the result (For
division, if the denominator is zero, output an appropriate message.)
Some sample outputs follow: 3+4=7 13 * 5=65.
Subject: Re: C++
Answered By: leapinglizard-ga on 09 Dec 2002 19:07 PST
I made the assumption that each part of the expression is to be
entered separately, and that the user wants to carry out a single
calculation each time the program runs. Code follows.

using namespace std;

int main() {
    int a, b, c;
    char op;
    cout << "enter first integer: ";
    cin >> a;
    cout << "enter second integer: ";
    cin >> b;
    cout << "enter operation [+-*/]: ";
    cin >> op;
    switch (op) {
        case '+':
            c = a+b;
        case '-':
            c = a-b;
        case '*':
            c = a*b;
        case '/':
            if (b == 0) {
                cout << "error: division by zero\n";
                return 0;
            c = a/b;
            cout << "\nerror: unknown operator\n";
            return 0;
    cout << a << ' ' << op << ' ' << b << " = " << c << '\n';
    return 0;

If you have trouble compiling the program or if you'd like me to make
modifications, please let me know before assigning a rating.


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