20.To print diamond pattern

   *

 ***

*****

 ***

   *

#include <stdio.h>

int main()

{

  int n, c, k, space = 1;

  printf("Enter number of rows\n");

  scanf("%d", &n);

  space = n - 1;

  for (k = 1; k <= n; k++)

  {

    for (c = 1; c <= space; c++)

      printf(" ");

    space--;

    for (c = 1; c <= 2*k-1; c++)

      printf("*");

    printf("\n");

  }

  space = 1;

  for (k = 1; k <= n - 1; k++)

  {

    for (c = 1; c <= space; c++)

      printf(" ");

    space++;

    for (c = 1 ; c <= 2*(n-k)-1; c++)

      printf("*");

    printf("\n");

  }

  return 0;

}