Practical Programs

#include<iostream.h> // This line includes the header file iostream.h, which provides input/output operations.
#include<conio.h>    // This line includes the header file conio.h, which provides console input/output operations.

void swap(float &x,float &y) // This line defines the swap function, which takes two float variables by reference.
{
   float t=x; // This line creates a temporary variable t and assigns it the value of x.
   x=y;       // This line assigns the value of y to x.
   y=t;       // This line assigns the value of t to y.
}

void main() // This line defines the main function, which is the entry point of the program.
{
    void swap(float &,float &); // This line declares the swap function.
    float a,b; // This line declares two float variables called a and b.
    cin>>a>>b; // This line reads two float values from the console and assigns them to a and b.
    cout<<"a="<<a<<"b="<<b<<endl; // This line displays the initial values of a and b.
    swap(a,b); // This line calls the swap function, passing a and b as arguments.
    cout<<"a="<<a<<"b="<<b<<endl; // This line displays the new values of a and b.
    getch(); // This line waits for the user to press a key before closing the console window.
}