[Solved] How is “a” used in my program?

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You declare an uninitialized variable of type int with identifier a: 

int a;

The user provides a value to a. 

std::cin >> a;

A copy is returned from the function: 

return a;

Calls to the getValueFromUser() will create a temporary a,
assign it to user input, and return it each time.

solved How is “a” used in my program?