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pattern program for square

Discussion in 'C' started by cexpert, Nov 30, 2010.

  1. cexpert

    cexpert New Member

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    hello frnds, please help me with this program.

    Q : Ypu are given an odd number as input and you have to write a function to draw alternative squares of 1s and 0s.

    Sample : input number : 7

    Output : 1 1 1 1 1 1 1
    1 0 0 0 0 0 1
    1 0 1 1 1 0 1
    1 0 1 0 1 0 1
    1 0 1 1 1 0 1
    1 0 0 0 0 0 1
    1 1 1 1 1 1 1

    Prototype for the function : void drawsquare(int input);

    Please provide generic code for any odd number entered.
     
  2. virxen

    virxen New Member

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    something like this maybe

    Code:
    #include <stdio.h>
    #include <string.h>
    #include <stdlib.h>
    
    void drawsquare(int input);
    
    int reverse(char *);
        char before[100]="";
        char after[100]="";
        
    int main(){
        int squares;
    
        printf("\n number of squares=");
        scanf("%d",&squares);getchar();
        drawsquare(squares);
        getchar();
        return 0;
    }
    
    void drawsquare(int squares){
        int i,j;
    for (i=1;i<=squares;i++){
            if (i>=squares/2+2){
            int length1=strlen(before);
            if (length1-1>=0){
                before[strlen(before)-1]='\0';
                strcpy(after,before); 
                reverse(after);
            }
            }
            printf("\n%s",before);
            for (j=0;j<squares-strlen(before)*2;j++){
                printf("%d",i%2);
            }
            printf("%s",after);
            if (i<squares/2+2){
                char temp[10];
                itoa(i%2,temp,10);
                strcat(before,temp); 
                strcpy(after,before); 
                reverse(after);   
            }  
        }
    }
    
    
    int reverse(char * after1) {
    char temp[100];
    int i;
    for (i=0;i<strlen(after1);i++)
        temp[i]=after1[strlen(after1)-i-1];
    temp[strlen(after1)]='\0';
    strcpy(after1,temp);
      return 0;
    }
    
    
     
    Last edited: Dec 1, 2010
    cexpert and shabbir like this.
  3. xpi0t0s

    xpi0t0s Mentor

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    Nice one. Here's another solution. BTW OP, you should also work on your own ideas, not just hand this stuff in. Plagiarism is a serious offence in academic circles (and tutors can spot it a mile off).
    Code:
    void drawsquare(int input)
    {
    	int maxN=(input-1)/2;
    	printf("input=%d; maxN=%d\n",input,maxN);
    	for (int y=-maxN; y<=maxN; y++)
    	{
    		for (int x=-maxN; x<=maxN; x++)
    		{
    			int px=(x<0) ? -x : x;
    			int py=(y<0) ? -y : y;
    			char digit='0';
    			for (int M=1; M<=maxN; M+=2)
    			{				
    				if ((px==M && py<=M)) || (py==M && px<=M))
    					digit='1';
    			}
    			putchar(digit);
    		}
    		putchar('\n');
    	}
    	putchar('\n');
    }
    
     
    cexpert likes this.

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