draw a diamond with hole

diamond.c

/*
*   HW03_091044005_PPART_1.c
*
*   CREATED BY      :Sinan NAR
*   CREATING DATE   :25/03/2011
*
*   DESCRIPTION
*   This program get an odd number from user
*   And check this number that is between 1-21 and is it an odd number
*   if these statements are okey,
*   program draw a diamond with stars and middle of diamond should be an square with spaces
*
*   NOTE:
*   when the program writing;we seperate the shape as 4 part cause of the space shape in middle
*   fist part of the shape we call it PART A and there is no space in the middle of it
*   middle of the shape,i mean square part with space that include,we seperate it again as PART B and PART c
*   PART B is the bigger part and PART C is the smaller part of the middle shape with space square
*   fourth part of the shape we call it PART D and there is no space in the middle of it
*   when we seperate this whole shape as four part,we have some problem with spaces but aour algoritm
*   could solve this problem. we have some loop body in PART A and PART D for writing more space
*   it makes our shape what you want from us
*
*
*   REFERENCES:
*   [1] 102_HW_03.pdf
*/

#include <stdio.h>

void draw_diamond(int);
void error(void);

void main()
{
    int sekil;
    printf("\n\tEnter an odd number \n\tThat should be between 1 and 21 \n\tFor drawing diamond\n>");
    scanf("%d",&sekil);

        while( sekil<1 || sekil>21 || (sekil%2)==0 )
        {
            error();
            scanf("%d",&sekil);
        }


        //algoritmamiz 1 degeri icin haric diger butun degerler icin calistigi icin bunu yaptik
        if(sekil==1)
        {
            printf(" * ");
        }
        else
        {
            draw_diamond(sekil);
        }

}


void draw_diamond(int m)
{
     int i,g,j,x,y,z,t,l,n,b,c,h;
     int kare;
    x=m-2;
    y=(x+1)/2;
    z=(x-1)/2;

    /*** KISIM A ***/
    for ( i=0;i<=(m+1)/2;i++ )
    {
        for(b=0;b<(m-1)/2;++b)
        {
            printf("  ");   //dorde ayirdigimiz icin kaynaklanan baslangictaki kayip boslugu yazdiracak
        }
        for ( j=0;j<=((m+1)/2)+1-i;j++) //norma olmasi gereken boslugu yazdiracak
        {
            printf("  ");
        }
        for ( g=0;g<=2*i-2;g++)  //yildizi yazdiracak
        {
            printf(" *");
        }
        printf("\n");
    }


    /*** KISIM B ***/
    for(t=0,h=y;t<y;++t,--h) //i satir numarasi
    {

        for( l=h;l>=0;--l )//boslugu yazdiracak
        {
            printf("  ");
        }

        for (n=0;n<=t+1;++n )  //yildizlari yazdiracak
        {
            printf(" *");
        }

        for (kare=0;kare<x;++kare)  //n-2 tane bosluk yazdiracak
        {
            printf("  ");   //icerideki kareyi olusturan bosluklar
        }

        for( n=0;n<=t+1;++n ) //yildizlari yazdiracak
        {
            printf(" *");
        }
        printf("\n");
    }


    /*** KISIM C ***/
    for(t=z,c=1;t>0;--t,++c)
    {
        for (l=0;l<=c+1;++l )  //boslugu yazdiracak
        {
            printf("  ");
        }
        for(n=0;n<t+1;++n)  //yildizlari yazdiracak
        {
            printf(" *");
        }
        for (kare=0;kare<x;++kare)  //boslugu yazdiracak
        {
            printf("  ");
        }
        for (n=0;n<t+1;++n) //yildizi yazdiracak
        {
            printf(" *");
        }
        printf("\n");
    }




    /*** KISIM D ***/
    for(i=1;i<=(m+1)/2;i++)
    {
        for(b=0;b<(m-1)/2;++b)
        {
            printf("  ");   //sekli dorde bolmemizden dolayi olsuan kaymayi onlemek icin bosluk yazdiracak
        }
        for( j=0;j<=i;j++)  //olmasi gereken boslugu yazdiracak
        {
            printf("  ");
        }
        for(g=i*2;g<=(m+1);g++)  //yildizi yazdiracak
        {
            printf(" *");
        }
        printf("\n");
    }

}

void error(void)
{
    printf("AN ERROR OCCURRED\n");
    printf("It can be caused by on of\n");
    printf("these fallowing statements\n");
    printf("------------------------------------\n");
    printf("|           YOU ENTERED            |\n");
    printf("| 1.  not an odd number            |\n");
    printf("| 2.  a number that bigger than 21 |\n");
    printf("| 3.  a number that smaller than 1 |\n");
    printf("------------------------------------\n");
    printf("Please again enter\n");
    printf("an odd number \n");
    printf("that should be between 1-21\n");
    printf("\n>");
}