How to Write a Simple Calculator Program using C++ Programming language
Here we are writing a Calculator Program using C++ Programming language.
This is one of the simplest program a beginner can write and understand a lot about computer programming.
The Calculator Program that we are writing here will work on two numbers and it will support Addition, Subtraction, Multiplication and Division operations.
Program Source Code : Calculator.cpp
1 #include <iostream>
2
3 using namespace std;
4
5 int main(){
6
7 char op;
8 double num1,num2;
9
10 cout << "Enter the Operator ( +, -, *, / ) : ";
11 cin >> op;
12
13 cout << "Enter two numbers one by one : ";
14 cin >> num1 >> num2;
15
16 switch ( op ){
17
18 case '+':
19 cout << num1 << " + " << num2 << " = " << (num1 + num2);
20 break;
21
22 case '-':
23 cout << num1 << " - " << num2 << " = " << (num1 - num2);
24 break;
25
26 case '*':
27 cout << num1 << " * " << num2 << " = " << (num1 * num2);
28 break;
29
30 case '/':
31 if( num2 != 0.0 )
32 cout << num1 << " / " << num2 << " = " << (num1 / num2);
33 else
34 cout << "Divide by zero situation";
35
36 break;
37
38 default:
39 cout << op << " is an invalid operator";
40 }
41
42 return 0;
43 } Program Output : Run 1
Enter the Operator ( +, -, *, / ) : +
Enter the two Numbers one by one : 10 20
10 + 20 = 30
Program Output : Run 2
Enter the Operator ( +, -, *, / ) : -
Enter the two Numbers one by one : 10 30
10 - 30 = -20
Program Output : Run 3
Enter the Operator ( +, -, *, / ) : *
Enter the two Numbers one by one : 10 50
10 * 50 = 500
Program Output : Run 4
Enter the Operator ( +, -, *, / ) : /
Enter the two Numbers one by one : 10 20
10 / 20 = 0.5
Program Output : Run 5
Enter the Operator ( +, -, *, / ) : /
Enter the two Numbers one by one : 50 0
Divide by Zero situation
Program Output : Run 6
Enter the Operator ( +, -, *, / ) : ?
Enter the two Numbers one by one : 10 20
? is an invalid Operator