//function :- DRY (donot repeat yourself)
    // we can modularize the program using the function
    // seperate the cde into logical self-contained units
    //These units are reusable
//c++  program:
        //c++ standared templete library(STL)(ie.vector ,isostream)
        //third party library(coco2dx,unreal,spring,cry engine)
        //self created or our own function
                //(dont reinvent the wheel)
        // Abstraction in oop








//function defination(user define function)
    // function type function name(parameters){
        //statements(body of the function)
        //return type
        //}
        // name :-same rule as variables it should br meaningful
        // parameter list:-the variable passed into the function -their type must be specified
        //return tupe - type pf the data is returned by the function.
        //body:-statements that are executed when the function is called - it lies within the scope

/*#include<iostream>
using namespace std;
void hello(){
    cout<<"hello";
}
void world(char name[]){
    hello();
    cout<<"world"<<name<<endl;
}
int main(){
    world("rupesh");
    return 0;
}

*/


/*
#include<iostream>
using namespace std;
const double pi=(3.14159);
double calc_area_circle(double radius ){
    return pi*radius*radius ;
}
double calc_area_cylinder(double radius,double height){
    return pi*radius*height;
}
void area_circle(){
    double radius={0};// c++ standared brace initialization double radius{0}
    cout<<"enter the radius of the circle";
    cin>>radius;
    cout<<"The area of the circle is "<<calc_area_circle(radius);
}
void area_cylinder(){
    double radius={0};
    double height ={0};// c++ STANDARED copy-brace initialization double radius={0}
    cout<<"Enter the radius of the cylinder";
    cin>>radius;
    cout<<"Enter the height of the cylinder";
    cin>>height;
    cout<<"the area of the cylinder is "<<calc_area_cylinder(radius,height);
}
int main(){
    area_cylinder();
    area_circle();
}

   */
//function prototype:
    //-It tells the compiler about the function befor it is used .
    //-Also called as forward  declaration
    //-paced at the top of the beginning of the program




//function prototypes
/*double calc_area_circle(double radius);
double calc_area_cylinder(doube radius,double height);
void area_circle();
void area_cylinder();
 int main(){}
declaration of the functions








//function parameters:
 * when we call a function we pass in data to the function
 * In function call they are called Actual Parameters .(arguments )
 *In function defination they are called Formal parameters.(parameters)
 *int add(int a, int b)//prototype
 *int main(){
 * int x={1};
 * int y={4};
 * add(x,y); // actual parameter }
 * int addition(int a., int b){  // formal parameter
 * return a+b;}
//pass_by_value:
 * when you pass a data into a function it is called pass-by-value
 * A copy of the data is passed into the function.
 * whatever changes you make to the parameters in the function dosent affedt the argument that was passed in.
 * what happens in a function stays in the function
 *
 *

//return statement
//Defult parameters value
//Overloading
//passing array to the function
//pass_by_refernce
//infinite function
//Auto return type
//Return reference
*/












//assinmet 2:
    // conditional statement(if else ,nested if..else case ...break)
    // looping satements(for loop,while looop, do..while loop,nested loop)