help with for loop in C program

Hi,
I want to make this pattern in C program with "for loop or nested for loop ONLY".
******
*****'
****
***
**
*
and also:
"AN EMPTY RHOMBUS"using * sign.
what is i can't understand is that how could i devise a method to do it simply by looking at any pattern?

Reply 1

secretmessages

The first part is easy, no?

x=6;

for (n=x; n>0; n--)
{
   for (i=n; i>0; i--)
   {
      printf("%s","* ");
   }
   prinf("%s\n","");
}

I might be missing the point, but let me know. Also, the code might not be 100% correct but it should give you the general idea.

Reply 2

Xatima

secretmessages

The first part is easy, no?

yes yes,ofcourse....u made it really easy for me to understand.
and also i have run the program,its giving the exact output i asked for.
THX a lot.

BUT one thing more:what about programs like this:
1.make an empty rhombus
OR
2.
*
**
***
****
*****
****
***
**
*

Reply 3

AugustWestie

secretmessages

The first part is easy, no?

x=6;

for (n=x; n>0; n--)
{
   for (i=n; i>0; i--)
   {
      printf("%s","* ");
   }
   prinf("%s\n","");
}

I might be missing the point, but let me know. Also, the code might not be 100% correct but it should give you the general idea.

printf() doesn't have to take multiple arguments. printf("*"); or printf("\n"); would suffice.

Reply 4

secretmessages

Well, for the second question you asked, it's just basically what I wrote before with a bit added on in front? Right? So...

x=6;

/* this part is just the reverse of your first question
except for the very last line (of 6 *'s) */

for (n=1; n<x; n++)
{
   for (j=n; i>0; i--)
   {
      printf("%s","* ");
   }
   printf("%s\n","");
}

/* this part is exactly the same as your first question */

for (n=x; n>0; n--)
{
   for (i=n; i>0; i--)
   {
      printf("%s","* ");
   }
   printf("%s\n","");
}

Or as someone has said, you could just say [noparse]printf("* ")[/noparse] but I wasn't sure about that. Change the value of x depending on the length of your longest line. In your example, change it to 5.

Reply 5

Acklay

Xatima

yes yes,ofcourse....u made it really easy for me to
1.make an empty rhombus
*

This should to the trick to make an empty rhombus:

#include <stdio.h>

/* The height of the rhombus, should be an odd number to look correct */
#define HEIGHT 11

int main(int argc, char** argv)
{
  int l_pos; /* The current position of the left side of thr rhombus*/
  int r_pos; /* The current position of the right side of the rhombus */
  int i;

  /* Start at the centre of the rhombus */
  l_pos = r_pos = (HEIGHT / 2);	
  
  for(i = 0; i < HEIGHT; i++)
  {
    int j;
    for(j = 0; j < r_pos; j++)	/* Iterate till we get to the right hand side */
    {
      if(j == l_pos && l_pos != r_pos)	/* If we're at the left side, print a '*' */
      {
	    printf("*");
      }
      else	/* Otherwise print a space for padding */
      {
	    printf(" ");
      }
    }
    printf("*\n");	/* Now at the right hand side, so print a '*' and move to next line */
	
    if(i < (HEIGHT / 2))	/* Once we get to half-way down the rhombus, the sides should start closing in */
    {
      l_pos--;
      r_pos++;
    }
    else
    {
      l_pos++;
      r_pos--;
    }
  }
}

Reply 6

Xatima

thx 4 everybody's help
i had just been stuck at one more problem:
how to print this using for loop:
-----*
----**
---***
--****
-*****
--****
---***
----**
-----*

Reply 7

Acklay

Xatima

thx 4 everybody's help
i had just been stuck at one more problem:
how to print this using for loop:
-----*
----**
---***
--****
-*****
--****
---***
----**
-----*

Thats just a simplified version of my earlier answer:

#include <stdio.h>

/* The height of the shape */
#define HEIGHT 17

/* The width of the shape */
#define WIDTH (HEIGHT / 2)

int main(int argc, char** argv)
{
  int i;
  int pos = WIDTH;	/* The '*' chars should start at the right side */
  for(i = 0; i < HEIGHT; i++)
  {
    int j;
    for(j = 0; j < WIDTH; j++)
    {
      if(j < pos)	/* If we're before pos, print a padding space */
      {
	    printf(" ");
      }
      else	/* Else we've reached the start of the '*' chars */
      {
	    printf("*");
      }
    }
    printf("\n");

    if(i < (HEIGHT / 2))	/* If we're less than half-way down the shape expand leftwards */
    {
      pos--;
    }
    else
    {
      pos++;
    }
  }
}