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Example to check if an integer (entered by the user) can be expressed as the sum of two prime numbers of all possible combinations with the use of functions. To understand this example, you should have the knowledge of the following C++ programming topics: C++ for Loop C++ if, if...else and Nested if...else C++ Functions Types of User-defined Functions in C++ This program takes a positive integer from the user and checks whether that number can be expressed as the sum of two prime numbers. If the number can be expressed as the sum of two prime numbers, the output shows the combination of the prime numbers. To perform this task, a user-defined function is created to check prime number.