CS 2123 Data Structures Assignment 1 Due Friday February 5 1. (100 pts) Write a

Question

CS 2123 Data Structures Assignment 1 Due Friday February 5 1. (100 pts) Write a program to create a pgm file with 8xs checkerboard pattern. Image dimensions will be 800x800 pixels and each black and white cell will be 100x100 pixels. Consider the following figure for details. In the figure B denotes black cells and W denotes white cells. 800 100 100 100 100 W 800 100W Figure 1: Checkerboared PGM file format is as follows P2 Width Height MaxGray Data Width and height are width and height of the image. MaxGray is the maximum gray value. This will be 255 in our case. Data is grayscale pixel values (0 for black, 255 for white) separated by space. When your program produces the pgm files, you can use gpicview or gimp to open pgm files on machines running Linux. Use pgm extension for your files. Sample pgm file is given below P2 7 5 256 256 266 256 255 255 255 255 200 200 200 200 200 200 200 150 150 150 150 180 160 160 100 100 100 100 100 100 100 0 6O 60 80 60 50 s0 Submit it your program electronically using the Wackboard system

Explanation / Answer

Try this program once

//this program just displays an 8 x 8 board

#include <stdio.h>

#include <conio.h>

int left;            //left edge of board

int right;          //right edge of board

int width;        //width of square in cols

int top;          //top row

int bottom;     //bottom row

int row;

int col;

int board[8][10];   //the current playing board-it is 10 columns wide to allow the

//use of pairs of digits for representing the board in this array see page 159 in

//How Computers Play Chess

int number;

int main(void) {

  void Newboard();

  int i;

  left=2;               //left edge of board

  right=left+40;     //right edge of board

  width=5;            //width of square in cols

  top=2;               //top row

  bottom=top+16; //bottom row

   Newboard();

   i = getchar(); ++i;

   return 0;

}

void Newboard() {

  void Drawsq(char sqr, int col, int row);

  void Putpieces();

  const unsigned char bsqr = '°';    //black square

  const unsigned char wsqr = '²';    //white square

  unsigned char sqr= wsqr;

  int j, color = 0;

  for(row=0;row<8;row++) {

    for(col=0;col<10;col++)

        board[row][col] = 0;

      if(row==0) {

        board[row][0]=4;board[row][1]=2;board[row][2]=3;

        board[row][3]=5;board[row][4]=6;board[row][5]=3;

        board[row][6]=2;board[row][7]=4;board[row][8]=99;

        board[row][9]=99;

      }

      if(row==1) {

        board[row][0]=1;board[row][1]=1;board[row][2]=1;

        board[row][3]=1;board[row][4]=1;board[row][5]=1;

        board[row][6]=1;board[row][7]=1;board[row][8]=99;

        board[row][9]=99;

      }  

      if(row==6) {

        board[row][0]=-1;board[row][1]=-1;board[row][2]=-1;

        board[row][3]=-1;board[row][4]=-1;board[row][5]=-1;

        board[row][6]=-1;board[row][7]=-1;board[row][8]=99;

        board[row][9]=99;

      }  

      if(row==7) {

        board[row][0]=-4;board[row][1]=-2;board[row][2]=-3;

        board[row][3]=-5;board[row][4]=-6;board[row][5]=-3;

        board[row][6]=-2;board[row][7]=-4;board[row][8]=99;

        board[row][9]=99;

      }

  } //end of for row (for col is not braced)

  clrscr();

  for(row=top;row<bottom;row+=2) {

    if (color>0) {   //swap color of sqr every row

     color=0;

     if(sqr==wsqr)

       sqr=bsqr;

     else

       sqr=wsqr;

    }

    for(col=left;col<right;col+=5) {

      gotoxy(col,row);

      Drawsq(sqr, col, row);

      color ++;

        if (color>0) {

        color=0;

          if(sqr==wsqr)         //swap color of sqr every col too

            sqr=bsqr;

          else

            sqr=wsqr;

        }//end of if

      } //end of for col

    color ++;

  } //end of for row

  Putpieces();

}

void Drawsq(char sqr, int col, int row) {

  int j;

  gotoxy(col, row);                 //top half of sqr

  for(j=0; j<5; j++)

    putch(sqr);                        //each square is 5 cols X 2 rows

  gotoxy(col,row+1);

  for(j=0; j<5; j++)     //lower half of sqr

    putch(sqr);                   

    

   number++;

   gotoxy(30,20);

     printf("Been Here %d Times", number);

  }

void Putpieces() {

  int j, k, midrow, midcol;

  midrow=bottom-2;

  midcol=left+2;

  for(k=0;k<8;k++) {

    for(j=0;j<8;j++) {

      gotoxy(midcol,midrow);

        if(board[k][j]!=0)

        printf("%d",board[k][j]);

        midcol+=width;

    }

    midcol=midcol-(8*width);

    midrow-=2;

  }

}

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