Function prototype and definition

Function Prototype:

A function prototype is also known as a function declaration.

A function declaration tells the compiler about a function name and how to call the function.

It defines the function before it is being used or called.

A function prototype needs to be written at the beginning of the program.


Syntax:

return-type function-name (arg-1, arg-2, ...);

Example:

void addition(int, int);


Function Definition:

A function definition defines the functions header and body.

A function header part should be identical to the function prototype.

  • Function return type
  • Function name
  • List of parameters

A function body part defines function logic.

  • Function statements

Syntax:
return-type function-name(arg-1, arg-2, ...);
{
        //... function body
}
Example:
void addition(int x, int y)
{
    printf("Addition is = %d",(x+y));
}

Drafted on 🌏 by,

Jal


☮

peace

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