C++ Method or Function With Parameter Programming

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C++ function parameters

A function is a set of different statements which is use to perform a specific task.If you want to pass any user value in function arguments then it must declare variables that accept the values of the arguments. These variables are known as parameters of the function.

compiler knows that every name with () bracket is a function.

In this lecture we'll discuss built-in functions and user define functions.
functions provided by C++ are called built-in functions Math() ,rand()etc.
functions written by programmer In C++ program to perform a specific task depends on programmer requirements like addition between 2 or more numbers are known as User Define functions.

functions use to divide and organize our program in different functions which is helpful for finding errors if any appear during programming.
we declare a function using return type, function name and parameters.
Syntax of declaring function is very simple

returnType functionName (int para1,int para2)

{

  // function statements

}

ReturnType

return type of a function tells compiler that what kind of value this function is going to return for example if we use int as a return type of a function it'll return an integer value. void return nothing.

FunctionName

programmer define name of a function and parameters to make a function signature.

Parameter & Argument

while declaring a function we declare parameters in function signature and when we call function in to execute we'll pass argument in function calling.A parameter is a placeholder. When a function is called, we pass an argument to the function.

first we need to use function signature at the top and implement function body wherever u want in program

Syntax of function is very simple

int Add(int para1,int para2); // signature with parameter
int main(){
   Add(10,20); // calling & passing argument
}
int Add(int para1,int para2){
 return (para1+para2);
}

Example

Function

Parameter

1. #include <iostream>  
2. using namespace std;
3. int Add(int para1,int para2); // function signature
4. 
   
5. int main( ){
6.  cout<< Add(20,30); // calling and passing Argument
7.  return 0;
8. }
9. 
   
10. int Add(int para1,int para2){
11.  return para1+para2;
12. }

Console :

50

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