Lab 3 Simple Calculator solution

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Programming assignment (100 pts): Write a computer program in C which will simulate a calculator. Your calculator needs to support the five basic operations (addition, subtraction, multiplication, division and modulus) plus primality testing (natural number is prime if it has no non-trivial divisors). Example of the output follows:
Calculator Menu: (1) Addition (2) Subtraction (3) Multiplication (4) Division (5) Modulus (integers only) (6) Test if prime (integers only) (7) Exit
Please choose an operation: 2 Enter the first number: 18 Enter the second number: 20 18 – 20 = -2
Calculator Menu: (1) Addition (2) Subtraction (3) Multiplication (4) Division (5) Modulus (integers only) (6) Test if prime (integers only) (7) Exit Please choose an operation: 6 Enter the number to be tested: 22 Not prime: 2 x 11 = 22
Calculator Menu: (1) Addition (2) Subtraction (3) Multiplication (4) Division (5) Modulus (integers only) (6) Test if prime (integers only) (7) Exit Please choose an operation: 7 Good Bye!
You program MUST be bug-free, well commented (Including author information, program description, lab section, date, etc.)