C++ LANGUAGE FUNCTION DECLARATIONS PAGE 69

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C++ LANGUAGE FUNCTION DECLARATIONS

Function Declarations 


A function declaration tells the compiler about a function name 
and how to call the function. The actual body of the function 
can be defined separately. 

A function declaration has the following parts: 

return_type function_name( parameter list ); 

For the above defined function max(), following is the function declaration: 

int max(int num1, int num2); 

Parameter names are not important in function declaration only 
their type is required, so following is also valid declaration: 

int max(int, int); 

Function declaration is required when you define a function in 
one source file and you call that function in another file. In 
such case, you should declare the function at the top of the 
file calling the function.