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  1. #include<stdio.h>
  2. int main()
  3. {
  4.     int n;
  5.     scanf("%d", &n);
  6.  
  7.     /// first half
  8.     int space = n-1;
  9.     int star = 1;
  10.     for(int i=1; i<=n; i++)
  11.     {
  12.         for(int j=1; j<=space; j++)
  13.         {
  14.             printf(" ");
  15.         }
  16.  
  17.         for(int j=1; j<=star; j++)
  18.         {
  19.             printf("*");
  20.         }
  21.  
  22.         printf("\n");
  23.  
  24.         /// preparing for the next row
  25.         star = star + 2;
  26.         space = space - 1;
  27.     }
  28.  
  29.     /// second half
  30.     space = 1;
  31.     star = ((2*n)-1) - 2; /// last line of the first half has (2*n)-1 stars, and the first line of the second half will have ((2*n)-1) - 2 stars
  32.  
  33.     for(int i=1; i<n; i++)
  34.     {
  35.         for(int j=1; j<=space; j++)
  36.         {
  37.             printf(" ");
  38.         }
  39.  
  40.         for(int j=1; j<=star; j++)
  41.         {
  42.             printf("*");
  43.         }
  44.  
  45.         printf("\n");
  46.  
  47.         /// preparing for the next row
  48.         star = star - 2;
  49.         space = space + 1;
  50.     }
  51. }
  52.  
Success #stdin #stdout 0s 5312KB
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stdin
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5
stdout
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    *
   ***
  *****
 *******
*********
 *******
  *****
   ***
    *
https://ideone.com/SpzdeI
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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