How do I declare and define a function in C++?

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Function Declaration and DefinitionA C++ function consist of two parts: Declaration: the return type, the name of the function, and parameters (if any) Definition: the body of the function (code to be executed)
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The syntax for a function declaration is: return_type function_name(parameter_list); In this example, int is the return type of the function, add is the name of the function, and (int x, int y) is the parameter list that specifies two integer parameters called “x” and “y.”
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