Line Algorithm and array using pointers in C++ Programming

Program to print, read and calculate sum, smallest, largest element an array using pointers in C++ Programming

 #include

 #include

 #include

 void read_array(int *,int );

 void print_array(int *,int );

 int sum_of_array(int *,int);

 int largest(int *,int);

 int smallest(int *,int);

 int main( )

    {

       clrscr();

       constint array_size=5;

       int array[array_size]={0};

       cout<<"\n Enter the contents of the array : \n"<

       read_array(array,array_size);

       clrscr();

       cout<<"\n *********************************** \n"<

       cout<<" The contents of the array are :\n"<

       print_array(array,array_size);

       cout<<"\n ***********************************\n"<

       getch();

       cout<<"The Sum of the given array is =   "<

       cout<<"\n ****************************************\n"<

       getch();

       cout<<"The maximum element of the array is = "<

       cout<<"\n ********************************************* \n"<

       getch();

       cout<<"The minimum element of the array is = "<

       cout<<"\n ********************************************** "<

       getch();

       return 0;

    }

/*************************************************************************//*************************************************************************///------------------------  Function Definitions  -----------------------///*************************************************************************//*************************************************************************//*************************************************************************///-----------------------  read_array(int *,int)  -----------------------///*************************************************************************/

void read_array(int *array,int array_size)

    {

       for(int count=0;count

      {

         cin>>*array;

         array++;

      }

    }

/*************************************************************************///-----------------------  print_array(int *, int)  --------------------///*************************************************************************/void print_array(int *array,int array_size)

    {

       for(int count=0;count

      {

         cout<<"\t\t\t Element ["<"] = "<<*array<

         array++;

      }

    }

/*************************************************************************///----------------------  sum_of_array(int *,int)  -------------------///*************************************************************************/int sum_of_array(int *array,int array_size)

    {

       int count;

       int sum=0;

       for(count=0;count

      {

         sum=sum+*array;

         array++;

      }

       return sum;

    }

/*************************************************************************///-------------------------  largest(int *,int)  ------------------------///*************************************************************************/

int largest(int *array,int array_size)

    {

       int max=*array;

       for(int count=0;count

      {

         if(*array>max)

        max=*array;

         array++;

      }

       return max;

    }

/*************************************************************************///-------------------------  smallest(int *,int)  ----------------------///*************************************************************************/

int smallest(int *array,int array_size)

    {

       int min=*array;

       for(int count=0;count

      {

         if(*array

        min=*array;

         array++;

      }

       return min;

    }

Draw a line using Bresenham's Line Algorithm for lines with slopes negative and greater than 1 in C++ Programming

 # include 

 # include 

 # include 

 # include

 void show_screen( );

 void bresenham_line(constint,constint,constint,constint);

 int main( )

    {

       int driver=vga;

       int mode=vgahi;

       int x_1=0;

       int y_1=0;

       int x_2=0;

       int y_2=0;

       do

      {

         show_screen( );

         gotoxy(8,10);

         cout<<"Coordinates of Point-I (x1,y1) :";

         gotoxy(8,11);

         cout<<"ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ";

         gotoxy(12,13);

         cout<<"Enter the value of x1 = ";

         cin>>x_1;

         gotoxy(12,14);

         cout<<"Enter the value of y1 = ";

         cin>>y_1;

         gotoxy(8,18);

         cout<<"Coordinates of Point-II (x2,y2) :";

         gotoxy(8,19);

         cout<<"ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ";

         gotoxy(12,21);

         cout<<"Enter the value of x2 = ";

         cin>>x_2;

         gotoxy(12,22);

         cout<<"Enter the value of y2 = ";

         cin>>y_2;

         initgraph(&driver,&mode,"..\\Bgi");

         setcolor(15);

                   bresenham_line(x_1,y_1,x_2,y_2);

         setcolor(15);

           outtextxy(110,460,"Press  to continue or any other key to exit.");

         int key=int(getch( ));

         if(key!=13)

        break;

      }

       while(1);

       return 0;

    }

/*************************************************************************///--------------------------  bresenham_line( )  ------------------------///*************************************************************************/

void bresenham_line(constint x_1,constint y_1,constint x_2,constint y_2)

    {

       int color=getcolor( );

       int x1=x_1;

       int y1=y_1;

       int x2=x_2;

       int y2=y_2;

       if(x_1>x_2)

      {

         x1=x_2;

         y1=y_2;

         x2=x_1;

         y2=y_1;

      }

       int dx=abs(x2-x1);

       int dy=abs(y2-y1);

       int two_dx=(2*dx);

       int two_dx_dy=(2*(dx-dy));

       int p=((2*dx)-dy);

       int x=x1;

       int y=y1;

       putpixel(x,y,color);

       while(y

      {

         y++;

         if(p<0 span="">

        p+=two_dx;

         else

        {

           x++;

           p+=two_dx_dy;

        }

         putpixel(x,y,color);

      }

    }

/*************************************************************************///--------------------------  show_screen( )  ---------------------///*************************************************************************/

void show_screen( )

    {

       restorecrtmode( );

       textmode(C4350);     cprintf("\n********************************************************************************");

       cprintf("*************************-                              -***********************");

       cprintf("*------------------------- ");

       textbackground(1);

       cprintf(" Bresenham's Line Algorithm ");

       textbackground(8);

       cprintf(" -----------------------*");

       cprintf("*-***********************-                              -*********************-*");

       cprintf("*-****************************************************************************-*");

       for(int count=0;count<42 count="" span="">

      cprintf("*-*     *-*");

       gotoxy(1,46);

       cprintf("*-****************************************************************************-*");

       cprintf("*------------------------------------------------------------------------------*");  cprintf("********************************************************************************");

       gotoxy(8,40);

       cout<<"Note :";

       gotoxy(8,41);

       cout<<"ÍÍÍÍÍÍ";

       gotoxy(12,43);

       cout<<"The slope of the line should be negative and greater than 1.";

       gotoxy(1,2);

    }