Program 7 - Inline Functions

#include<iostream.h>


inline float mul(float x,float y)
{
               return(x*y);
}


inline double div(double p,double q)
{
              return(p/q);
}


int main( )
{
            float a = 12.345;
            float b =  9.82;
        
            cout<<mul(a,b)<<endl;
            cout<<div(a,b)<<endl;


           return 0;
}
    
Output:
121.228
1.25713    


Click here to read about Inline Functions

Program 6 -Operator Overloading illustrated by Matrix Addition,Subtraction and Multiplication Program

The following program implements Function Overloading by doing addition,subtraction and multiplication of Matrices.

#include<iostream.h>
#include<iomanio.h>


const int MAXROW=3,MAXCOL=3;
struct matrix
{
         int arr[MAXROW][MAXCOL];
};


matrix operator+(matrix a,matrix b);
matrix operator-(matrix a,matrix b);
matrix operator*(matrix a,matrix b);
void mat_print(matrix p);


void main( )
{
           matrix a = {
                                    1,2,3,
                                    4,5,6,
                                    7,8,9,
                              };
           matrix b = {
                                     1,2,3,
                                     4,5,6,
                                     7,8,9,
                               };


           matrix c,d,e,f;


          c=a+b;
          d=a*b;
          e=a+b*c;
          f=a-b*c+d;


          mat_print(c);
          mat_print(d);
          mat_print(e);
          mat_print(f);


}


matrix operator+(matrix a,matrix b)
{
          matrix c;
          int i,j;


          for(i=0;i<MAXROW;i++)
          {
                        for(j=0;j<MAXROW;j++)
                                c.arr[i][j] = a.arr[i][j] + b.arr[i][j];
            }
         return c;
}

matrix operator-(matrix a,matrix b)

{

          matrix c;

          int i,j;

          for(i=0;i<MAXROW;i++)

          {

                        for(j=0;j<MAXROW;j++)

                                c.arr[i][j] = a.arr[i][j] - b.arr[i][j];

            }

         return c;

}

matrix operator*(matrix a,matrix b)

{

          matrix c;

          int i,j,k;

          for(i=0;i<MAXROW;i++)

          {

                        for(j=0;j<MAXROW;j++)

                          {

                                     c.arr[i][j]=0;

                                     for(k=0;k<MAXCOL;k++)      

                                                    c.arr[i][j] + = a.arr[i][k] * b.arr[k][j];

                            }

            }

          return c;

}

void mat_print(matrix p)

{

            int i,j;

            cout<<endl<<endl;

            for(i=0;i<MAXROW;i++)

             {

                          cout<<endl;

                          for(j=0;j<MAXCOL;j++)

                                    cout<<setw(5)<<p.arr[i][j];

               }

}

    

  Click here to read about Operator Overloading

Program 5- Program to demonstrate Function Overloading.

The program returns the absolute value of an argument.

#include<iostream.h>
void main( )
{
        int i=-25,j;
        long l=-100000L,m;
        double d=-12.34,e;
        int abs(int);
        long abs(long);
        double abs(double);


        j=abs(i);
        m=abs(l);
        e=abs(d);


        cout<<endl<<j<<endl<<m<<e;
}


int abs(int ii)
{
         return(ii>0?ii:ii*-1);
}
long abs(long ll)
{
         return(ll>0?ll:ll*-1);
}
double abs(double dd)
{
         return(dd>0?dd:dd*-1);
}


Click here to read about Function Overloading


      

Program 4- Program to switch between different cases.

This program takes in the user's choice as a screen input.
Depending on the user's choice, it switches between the different cases.
The appropriate message is then outputted using the 'cout' command.

#include <iostream.h>
#include <conio.h>

int main( )
{
        clrscr( );
        int choice;
        cout << "1. Talk" << endl;
        cout << "2. Eat" << endl;
        cout << "3. Play" << endl;
        cout << "4. Sleep" << endl;
        cout << "Enter your choice : " << endl;
        cin>>choice;

       switch(choice)
       {

            case 1 : 

            cout << "You chose to talk...talking too much is a bad habit." << endl;
            break;

           case 2 : 

           cout << "You chose to eat...eating healthy foodstuff is good." << endl;
           break;

           case 3 : 

           cout << "You chose to play...playing too much everyday is bad." << endl;
           break;

          case 4 : 

          cout << "You chose to sleep...sleeping enough is a good habit." << endl;
          break;

         default : 

         cout << "You did not choose anything...so exit this program." << endl;
       }
getch();

}

Sample Input:

3

Sample Output:

You chose to play...playing too much everyday is bad.

Program 3- Program to find if the number is prime or composite.

This program takes in an integer num1 as a screen input from the user.
It then determines whether the integer is prime or composite.
It finally outputs the approriate message by writing to the 'cout' stream.

#include <iostream.h>
#include <conio.h>
#include <process.h>

void main()
{
            clrscr();
            int num1,x;
            cout << "Enter an integer : " << endl;
            cin>>num1;
            for(x=2;x<num1;x++)
                 {
                      if(num1%x==0)

                          {
                             cout << num1 << " is a composite number." << endl;
                           }

                      else
                          {
                             cout << num1 << " is a prime number." << endl;                                            
                           }
                      }

 getch();
 exit(0);
}

Sample Input:

21

Sample Output:

21 is a composite number.

Program 2 - Program to enter the sale value and print the agent's commission

This program takes in the total sale value as a screen input from the user.
The program then calculates the agent's commission with the help of the 'IF-ELSE' command as follows :
5% if the total sale value is less than or equal to Rs10000.
10% if the total sale value is less than or equal to Rs.25000.
20% if the total sale value is greater than Rs.25000. It then outputs the agent's commission using the 'cout' command.

#include <iostream.h>
#include <conio.h>

void main( )
{
           clrscr( );
           long int svalue;
           float commission;
           cout << "Enter the total sale value : " << endl;
           cin>>svalue;
         if(svalue<=10000)
         {
                     commission=svalue*5/100;
                     cout << "For a total sale value of $" << svalue << ", ";
                     cout << "the agent's commission is $" << commission;
          }
         else if(svalue<=25000)
          {
                   commission=svalue*10/100;
                   cout << "For a total sale value of $" << svalue << ", ";
                   cout << "the agent's commission is $" << commission;
            }
        else if(svalue>25000)
          {
                   commission=svalue*20/100;
                   cout << "For a total sale value of $" << svalue << ", ";
                   cout << "the agent's commission is $" << commission;
            }
getch();
}                  

Sample Input:

26000

Sample Output:

For a total sale value of Rs.26000,

the agent's commission is Rs.5200

Program 1: a Simple program depicting the use of Class

#include<iostream.h>


class rectangle
{
        private:
                    int len,br;
        public:
                    void getdata( )
                    {
                           cout<<<"Enter length and breadth";
                           cin>>len>>br;
                      }


                 void setdata(int l,int b)
                  {
                           len=l;
                           br=b;
                   }


              void displaydata()
                {
                           cout<<<"Length = "<
                           cout<<<"Breadth = "<
                  }


              void area_peri()
                 {
                           int a,p;
                           a=len*br;
                           p=2*(len+br);
                           cout<<<"Area = "<
                           cout<<<"Perimeter ="<
                   }
};                                                       //End of Class


void main( )
{
              rectangle r1,r2,r3;        //define three objects of class rectangle
    
              r1.setdata(10,20);       //set data in elements of the object
              r1.display( );                //display the data set by setdata()
              r1.area_peri( );            //calculate and print area and perimeter


              r2.setdata(5,8);
              r2.displaydata( );
              r2.area_peri( );


             r3.getdata( );             //receive data from keyboard
            r3.displaydata( );
            r3.area_peri( );
}