C++ Program to Make Simple Calculator

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In this article, you will learn and get code to create a simple calculator using C++. Here are the list of calculator programs available in this article:

Simple Calculator Program
Calculator Program using user-defined Function

Make a Calculator in C++

The program given below creates a simple calculator in C++ programming that performs four basic mathematical operations such as addition, subtraction, multiplicatin, and division, depending on the user's choice.

To do the task of calculator, first receive the choice and then any two numbers (if choice is not to exit). Then use the switch case to identify the choice and perform required things as shown in the program given below:

The question is, write a calculator program in C++. Here is its answer:

#include<iostream>
using namespace std;
int main()
{
    float numOne, numTwo, res;
    int choice;
    do
    {
        cout<<"1. Addition\n";
        cout<<"2. Subtraction\n";
        cout<<"3. Multiplication\n";
        cout<<"4. Division\n";
        cout<<"5. Exit\n\n";
        cout<<"Enter Your Choice(1-5): ";
        cin>>choice;
        if(choice>=1 && choice<=4)
        {
            cout<<"\nEnter any two Numbers: ";
            cin>>numOne>>numTwo;
        }
        switch(choice)
        {
            case 1:
                res = numOne+numTwo;
                cout<<"\nResult = "<<res;
                break;
            case 2:
                res = numOne-numTwo;
                cout<<"\nResult = "<<res;
                break;
            case 3:
                res = numOne*numTwo;
                cout<<"\nResult = "<<res;
                break;
            case 4:
                res = numOne/numTwo;
                cout<<"\nResult = "<<res;
                break;
            case 5:
                return 0;
            default:
                cout<<"\nWrong Choice!";
                break;
        }
        cout<<"\n------------------------\n";
    }while(choice!=5);
    cout<<endl;
    return 0;
}

This program was build and run under Code::Blocks IDE. Here is its sample run:

Now enter your choice say 3, if you want to perform multiplication. After supplying 3 as choice, press ENTER key. Here is the output you will see:

Now supply any two numbers say 3.4 and 3 as input. Then press ENTER key to print its multiplication result as shown in the snapshot given below:

As you can see, the program again asks to enter the choice to perform the operation again, until user enters 5 as choice to exit from the calculator.

C++ Calculator Program using Function

This program also creates a calculator, but using a user-defined functions such as:

addFun() to add and returns addition of two numbers passed as its two arguments
subFun() subtracts two numbers. Second number (argument) gets subtracted from first
mulFun() multiplies two numbers
divFun() divides two numbers. First number (argument) gets divided by second

Now let's have a look at the program:

#include<iostream>
using namespace std;
float addFun(float, float);
float subFun(float, float);
float mulFun(float, float);
float divFun(float, float);
int main()
{
    float numOne, numTwo, res;
    int choice;
    do
    {
        cout<<"1. Addition\n";
        cout<<"2. Subtraction\n";
        cout<<"3. Multiplication\n";
        cout<<"4. Division\n";
        cout<<"5. Exit\n\n";
        cout<<"Enter Your Choice(1-5): ";
        cin>>choice;
        if(choice>=1 && choice<=4)
        {
            cout<<"\nEnter any two Numbers: ";
            cin>>numOne>>numTwo;
        }
        switch(choice)
        {
            case 1:
                res = addFun(numOne, numTwo);
                cout<<"\nResult = "<<res;
                break;
            case 2:
                res = subFun(numOne, numTwo);
                cout<<"\nResult = "<<res;
                break;
            case 3:
                res = mulFun(numOne, numTwo);
                cout<<"\nResult = "<<res;
                break;
            case 4:
                res = divFun(numOne, numTwo);
                cout<<"\nResult = "<<res;
                break;
            case 5:
                return 0;
            default:
                cout<<"\nWrong Choice!";
                break;
        }
        cout<<"\n------------------------\n";
    }while(choice!=5);
    cout<<endl;
    return 0;
}
float addFun(float a, float b)
{
    return (a+b);
}
float subFun(float a, float b)
{
    return (a-b);
}
float mulFun(float a, float b)
{
    return (a*b);
}
float divFun(float a, float b)
{
    return (a/b);
}

This program produces the same output as of previous program.

Same Program in Other Languages

C++ Online Test

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