Question

How do i write nested loops for producing somekind of patterns........using writePattern() function in C language..I have written the loop but is not working properly...

Asked by: Sambho

Typical programme question is like this
                                                            ..............a program which prompts the user to enter an integer (in the range 1-8)determining picture size and then uses functions which call writePattern to draw each of the following pictures. (The examples illustrate size 4).

     *
      *
       *
        *

        *
       *
      *
     *

*     *
 *   *
  * *
   *
  * *
 *   *
*     *  

     *...
     **..
     ***.
     ****

#include<stdio.h>
 
#define BLANK ' '
 
 
void writePattern(char c1, char c2, char c3, char c4, char c5, int n1, int n2, int n3, int n4, int n5, int length);
void writeCharFixCount(char, int *, int *);
 
int main( void) {
    
    char mark = '*';
    char dot = '.';
    int i;
    int width, length;
    int size;
    int x = size;
    //length == size;
    //width == size;
    
    printf("Please enter an integer in the range 1-8 both inclusive: ");
    scanf("%d", &size);
    
       for( i = 1; i <= size; i++){
                     writePattern('*','.',BLANK,BLANK,BLANK,1, size-1,0,0,0, size); 
                       if (i = size-x)
                      writePattern( '*','.',BLANK, BLANK, BLANK, size-x,size-(size-x),0,0,0, size);
                       
                      if (i = size-1)
                      writePattern( '*','.',BLANK, BLANK, BLANK, size-1,size-(size-1),0,0,0, size);
                        if (i= size)
                      writePattern('*','.',BLANK,BLANK,BLANK,size, size- size ,0,0,0, size);  
                      }
                      
                      return 0;
                  }
                  
    void writePattern(char c1, char c2, char c3, char c4, char c5,
                  int n1,  int n2,  int n3,  int n4,  int n5, int length)  {
	 while ((n1 > 0) && (length > 0))
        	 writeCharFixCount(c1, &n1, &length);
 
	 while ((n2 > 0) && (length > 0))
		 writeCharFixCount(c2, &n2, &length);
 
	 while ((n3 > 0) && (length > 0))
		 writeCharFixCount(c3, &n3, &length);
 
	 while ((n4 > 0) && (length > 0))
		 writeCharFixCount(c4, &n4, &length);
 
	 while ((n5 > 0) && (length > 0))
		 writeCharFixCount(c5, &n5, &length);
 
	 printf("\n");   /* advance the cursor to the beginning of a new line */
}
 
void writeCharFixCount(char c, int *count1, int *count2)
/* writes one copy of character c and decrements count1 and count2 */  {
	 printf("%c", c);
	 (*count1)--;
	 (*count2)--;
}

                                  
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Asked On
2009-09-25 at 05:24:42ID24761422
Topics

C Programming Language

,

C# Programming Language

,

Programming Languages

Participating Experts
2
Points
500
Comments
9

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Answers

 

by: epasquierPosted on 2009-09-25 at 05:42:10ID: 25422348

First, I believe that
size-(size-x) = x
same for size-(size-1) = 1

your first pattern is done by

for( i = 1; i <= size; i++) writePattern(BLANK,'*',BLANK,BLANK,,BLANK,i,1,size-i-1,0,0, size);

the second :

for( i = 1; i <= size; i++) writePattern(BLANK,'*',BLANK,BLANK,,BLANK,size-i-1,1,i,0,0, size);

the third is complicated and the fourth is easy but I have something to do now I will get back to you in few minutes

 

by: epasquierPosted on 2009-09-25 at 05:58:16ID: 25422447

so the fourth is

for( i = 1; i <= size; i++) writePattern('*', '.' BLANK,BLANK,BLANK,i,size-i,0,0,0, size);

the third is complicated because you might have odd or even size
before getting to it, writePattern needs improvements. don't bother with writeCharFixCount

void writePattern(char c1, char c2, char c3, char c4, char c5,
              int n1,  int n2,  int n3,  int n4,  int n5, int length)  
{
    for(;(n1>0) && length;n1--,length--) printf("%c", c1);
    for(;(n2>0) && length;n2--,length--) printf("%c", c2);
    for(;(n3>0) && length;n3--,length--) printf("%c", c3);
    for(;(n4>0) && length;n4--,length--) printf("%c", c4);
    for(;(n5>0) && length;n5--,length--) printf("%c", c5);
    printf("\n");   /* advance the cursor to the beginning of a new line */
}

                                              
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by: epasquierPosted on 2009-09-25 at 06:01:04ID: 25422462

ah ! for all the for loops when drawing patterns, I didn't see it it is not

for( i = 1; i <= size; i++)

but

for( i = 0; i < size; i++)

 

by: epasquierPosted on 2009-09-25 at 06:09:17ID: 25422532

so, now the third is

// draw first half. (size>>1) = size/2 truncated 
// (bitwise right shift of 1 digit). If size=5 => 2 
for( i = 0; i < (size>>1); i++) 
{
  writePattern(BLANK,'*', BLANK, '*', BLANK,i,1,size-2*(i+1),1,i, size);
}
// draw middle part if needed
if (size&1) // Odd size
{
  writePattern(BLANK,'*', BLANK, BLANK,BLANK,(size>>1),1,(size>>1),0,0,size);
}
// draw second half
for( i = (size>>1)-1; i>=0; i--) 
{
  writePattern(BLANK,'*', BLANK, '*', BLANK,i,1,size-2*(i+1),1,i, size);
}
                                              
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by: SambhoPosted on 2009-09-25 at 15:06:50ID: 25427657

Thanks a lot...........I appreciate your help a lot.............

                              I have been practicing for other different kinds of shape. Can you please also give loop for these patterns ....

          *
        ***
      *****
     *******
       

          *
        ***
        ***
      *****
      *****
      *****
    *******
    *******
    *******
    *******
                                Thank you very much in advance........................

 

by: epasquierPosted on 2009-09-25 at 17:04:01ID: 25428213

Well, this is getting better and better :o)
Can I ask you what the hell is that useful for ?

basically the 1st one is very easy and I'm sure you can do it yourself. Just try to show me you have understood the trick. If you can't then I'll help you, but not before monday.

The second is the same pattern with repetition of lines with another pattern, so it is also not difficult.

 

by: SambhoPosted on 2009-09-25 at 18:48:28ID: 25428452

Thank You very much for your immense help...................

                      I did for the triangle and giving my efforts to the christmas tree figure.....


Thank You once again.........

 

by: SambhoPosted on 2009-09-25 at 18:49:24ID: 31633489

Very good job...................

 

by: seminarPosted on 2009-09-25 at 23:00:08ID: 25428915

thank you

20120131-EE-VQP-002

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