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C++: Switch Statement

Posted on 2013-01-05
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Last Modified: 2013-01-05
Hello everyone, I recently started learning about the C++ Programming Language through online tutorials and would like some help with a basic program that I have written. The program is a simple calculator that will perform a desired operation and then ask for the user's input on what to do next. Here is my code below:

#include <cstdlib>
#include <iostream>

using namespace std;

float addition(float value1, float value2)
{
    return value1 + value2;  
}

float subtraction (float value1, float value2)
{
    return value1 - value2;  
}

float multiplication (float value1, float value2)
{
    return value1 * value2;  
}

float division (float value1, float value2)
{
    return value1 / value2;  
}


int main(int argc, char *argv[])
{
    float number1;
    float number2;
    int choice;
    cout << "Would you like to: \n\nAdd (1) \nSubtract (2) \nMultiply (3) \nDivide (4) \nQuit (5) \n" << endl;
    cout << "Choice: ";
    cin >> choice;
    while (true)
    {
        switch (choice)
        {
           case 1:
                {
               //Addition
               cout << "You are adding two numbers, enter the first number. \n Number 1: ";
               cin >> number1;
               cout << "Enter the second number. \n Number 2: ";
               cin >> number2;
               cout << "The answer is: " << addition(number1, number2) << endl;
               system("PAUSE");
               }
           case 2:
               {
               //Subtraction
               cout << "You are subtracting two numbers, enter the first number. \n Number 1: ";
               cin >> number1;
               cout << "Enter the second number. \n Number 2: ";
               cin >> number2;
               cout << "The answer is: " << subtraction(number1, number2) << endl;
               system("PAUSE");
               }
           case 3:
               {
               //Multiplication
               cout << "You are multiplying two numbers, enter the first number. \n Number 1: ";
               cin >> number1;
               cout << "Enter the second number. \n Number 2: ";
               cin >> number2;
               cout << "The answer is: " << multiplication(number1, number2) << endl;
               system("PAUSE");
               }
           case 4:
               {
               //Division
               cout << "You are dividing two numbers, enter the first number. \n Number 1: ";
               cin >> number1;
               cout << "Enter the second number. \n Number 2: ";
               cin >> number2;
               cout << "The answer is: " << division(number1, number2) << endl;
               system("PAUSE");
               }
           case 5:
               {
               cout << "Goodbye!";
               system("PAUSE");
               return 0;      
               }
           default:
               cout << "Please enter a value between 1 and 5";
        }    
    }
    system("PAUSE");
    return 0;
}

The "quit" option that I have put in works fine, but the other cases have issues. All of my cases except the default case will start with the desired operation, but will then immediately jump over to the following operation afterwards (i.e. pressing 1 will start the addition, but will go straight to asking for subtraction when it finishes). The default case does not loop back to the question that is asked at the beginning of the program. Any help is appreciated.
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Question by:Paul_ATL
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1 Comment
 
LVL 86

Accepted Solution

by:
jkr earned 200 total points
ID: 38747384
>>but will then immediately jump over to the following operation afterwards

Yes, you have to terminate each 'case:' branch with a 'break' statement, i.e.

    while (true)
    {
        switch (choice)
        {
           case 1:
                {
               //Addition
               cout << "You are adding two numbers, enter the first number. \n Number 1: ";
               cin >> number1;
               cout << "Enter the second number. \n Number 2: ";
               cin >> number2;
               cout << "The answer is: " << addition(number1, number2) << endl;
               system("PAUSE");
               }
               break; // <-----
           case 2:
               {
               //Subtraction
               cout << "You are subtracting two numbers, enter the first number. \n Number 1: ";
               cin >> number1;
               cout << "Enter the second number. \n Number 2: ";
               cin >> number2;
               cout << "The answer is: " << subtraction(number1, number2) << endl;
               system("PAUSE");
               }
               break; // <-----
           case 3:
               {
               //Multiplication
               cout << "You are multiplying two numbers, enter the first number. \n Number 1: ";
               cin >> number1;
               cout << "Enter the second number. \n Number 2: ";
               cin >> number2;
               cout << "The answer is: " << multiplication(number1, number2) << endl;
               system("PAUSE");
               }
               break; // <-----
           case 4:
               {
               //Division
               cout << "You are dividing two numbers, enter the first number. \n Number 1: ";
               cin >> number1;
               cout << "Enter the second number. \n Number 2: ";
               cin >> number2;
               cout << "The answer is: " << division(number1, number2) << endl;
               system("PAUSE");
               }
               break; // <-----
           case 5:
               {
               cout << "Goodbye!";
               system("PAUSE");
               return 0;      
               }
               break; // <-----
           default:
               cout << "Please enter a value between 1 and 5";
        }    
    }

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