Programming in C—Functions.
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Function Prototype
A function prototype is just the declaration of a function that specifies function's name, parameters and return type. It doesn't contain function body.
A function prototype gives information to the compiler that the function may later be employed in the program.
Syntax of Function Prototype
returnType functionName(type1 argument1, type2 argument2,...);
The function prototype isn't needed if the user-defined function is defined before the main() function.
Function Definition
Function definition contains the block of code to perform a selected task i.e. during this case, adding two numbers and returning it.
Syntax of Function Definition
returnType functionName(type1 argument1, type2 argument2, ...)
{
//body of the function
}
When a function is termed, the control of the program is transferred to the function definition. And, the compiler starts executing the codes inside the body of a function.
Function Call
Control of the program is transferred to the user-defined function by calling it.
Syntax of Function Call
functionName(argument1, argument2, ...);
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