A 2 - Strange Calculator, due Tues, Apr. 2

20 Mar 2019 in CS 102 on C++, Programming Basics

Assigned Wed, Mar. 20, ‘[Updated] Due Tues, Apr. 2 @ 23:59 via submission portal

Write your own strange calculator that meets the following requirements:

• at least five ‘strange’ calculations. Instead of the traditional calculator that adds, subtracts, multiplies, and divides numbers, think creatively about functions that aren’t usually done by a calculator; for example, adding strings instead of numbers, performing modulus, or calculating the force of an object given its mass and acceleration.
• an overloaded function name (that is, at least two functions with the same name)
• generally follow the ‘pretty code’ guidelines

Be prepared to present and explain your code in class.

Examples of strange functions are:

• a function that computes the nth number in the fibonacci sequence
• a function that determines if a given number is part of the fibonacci sequence
• a function that determines if a given number is prime or composite
• a function that determines if a given number is triangular
• a function that determines the time in a different country
• a function that prints the calendar of a month given the first day of the week

Submission Portal

Submit your responses here: https://forms.gle/9ejy5Mxw1Sqph7d37

Example

Below is the calculator we wrote together in class. It’s a calculator, but not a strange calculator (‘cause it does the traditional operations–add, subtract, multiply, divide).

#include <iostream>
#include <cmath>
#include <string>

using namespace std;

int addNumbers(int a, int b) {
    int sum = a + b;
    return sum;
}

int addNumbers(int c, int d, int f) { // overloading addNumbers() -- two functions have the same name, but different parameters
    int sum = c + d + f;
    return sum;
}

int multiplyNumbers(int a, int b) {
    int product = a * b;
    return product;
}

int subtractNumbers(int a, int b) {
    int result = a - b;
    return result;
}

int divideNumbers(int a, int b) {
    if (b != 0) { //cannot divide by 0
        cout << "Divide by 0 error." << endl;
        return -21312; //you have to return an integer.
    } else {
        int quotient = a / b;
        return quotient;
    }
}

int showMenu(){
    cout << "Choose which option you'd like to perform: " << endl;
    cout << "1. Add 2 integers" << endl;
    cout << "2. Add 3 integers" << endl;
    cout << "3. Subtract 2 integers" << endl;
    cout << "4. Multiply 2 integers" << endl;
    cout << "5. Divide 2 integers" << endl;

    int choice;
    cin >> choice;
    return choice;
}

int enterNumber(){
    cout << "Enter a number: ";
    int num;
    cin >> num;
    return num;
}

int main(){
    cout << "----------------------------" << endl;
    cout << "         CALCULATOR         " << endl;
    cout << "----------------------------" << endl;

    int x, y, z; //declare 3 variables

    int operation = showMenu();
    
    switch(operation){
        case 1: // add 2 numbers (x and y)
            x = enterNumber();
            y = enterNumber();
            cout << x << " + " << y << " = " << addNumbers(x, y) << endl;
            break;
        case 2: // add 3 numbers (x, y, and z)
            x = enterNumber();
            y = enterNumber();
            z = enterNumber();
            cout << x << " + " << y << " + " << z << " = " << addNumbers(x, y, z) << endl;
            break;
        case 3: // subtract 2 numbers
            x = enterNumber();
            y = enterNumber();
            cout << x << " - " << y << " = " << subtractNumbers(x, y) << endl;
            break;
        case 4: // multiply 2 numbers
            x = enterNumber();
            y = enterNumber();
            cout << x << " * " << y << " = " << multiplyNumbers(x, y) << endl;
            break;
        case 5: // divide 2 numbers
            x = enterNumber();
            y = enterNumber();
            cout << x << " / " << y << " = " << divideNumbers(x, y) << endl;
            break;
        default:
            cout << "You did not enter a valid menu choice. Try again." << endl;
            showMenu();
    }

    return 0;

    /* Example output:
        Choose which option you'd like to perform:
        1. Add 2 integers
        2. Add 3 integers
        3. Subtract 2 integers
        4. Multiply 2 integers
        5. Divide 2 integers
        2
        Enter a number: 4
        Enter a number: 5
        Enter a number: 4
        4 + 5 + 4 = 13
    */
}