Programming in C—Functions.

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I hope you all are fine and safe inside your homes. This is a weird time ongoing in the whole world and I hope it will get over soon. As during this time, everyone is locked into their homes. I want to share the C programming language with you. I hope you guys like it, so let's happen today's topic.

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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