C++ Language classes Fees

* Program to swap two numbers using a temporary variable with each statement explained with comments *

#include                // headerfile for cout statement
using namespace std;              // include standard library files

int main()                        // main()- starting point of the program with int return type  
{                                 //  start of main()
    int a = 5, b = 10, temp;      // 3 variables where a,b are initialised and a temp variable 

    cout << "Before swapping." << endl;               // print statement
    cout << "a = " << a << ", b = " << b << endl;     // values before swapping

    temp = a;                     // assign a to temp
    a = b;                        // assign b to a
    b = temp;                     // final step in  swapping with assigning temp ,ie, a to b

    cout << "\nAfter swapping." << endl;              // print statement
    cout << "a = " << a << ", b = " << b << endl;     // values after swapping

    return 0;                     //return value required coz on int return type of main()
}                                 // termination of main()

// Semi-colon ';' is termination of each valid C++ statement

1."stdio.h" in c program controls input-output functionalities and operations associated with it where as in c++ program iostream.h" controls input-output functionalities and operations associated with it.

2."stdlib.h" in c program controls memory management like calloc ,malloc. where as "conio.h" in c++ program controls memory management like new and delete etc.