C Program To Express A Number as Sum of Two Prime Numbers

https://technotip.com/7821/c-program-to-express-a-number-as-sum-of-two-prime-numbers/

Lets write a C program to check whether a user input/entered positive number can be expressed as sum of two prime numbers or not.

Prime Number: Any natural number which is greater than 1 and has only two factors i.e., 1 and the number itself is called a prime number.

Note: The user entered number need not be a prime number. But the 2 numbers, sum of which is equal to the original number, must be prime numbers.

For example, if user enters num as 14. Number 14 is not a prime number. We get following result:

3 + 11 = 14 7 + 7 = 14

Numbers 3, 11 and 7 are prime numbers.

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