Menu Driven C++ Program for a Simple Calculator

Problem Statement: Write a menu-driven program using the Switch case to calculate the following:

1. Addition of two numbers
2. Difference between two numbers
3. Product of two numbers
4. Division of two numbers
5. HCF of two numbers
6. LCM of two numbers

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Examples:

Input: num1 = 5, num2 = 7, choice = 1
Output: Sum is 12

Input: num1 = 5, num2 = 7, choice = 5
Output: GCD is 1

Implementation: 

Press 1 to calculate Sum of Numbers
Press 2 to calculate Difference of Numbers
Press 3 to calculate Product of numbers
Press 4 to calculate Division of numbers
Press 5 to calculate HCF of numbers
Press 6 to calculate LCM of numbers
Press 7 to exit
Enter your choice:
Choice is 1
Sum is 12

Time Complexity: O(n).
Auxiliary Space: O(1)