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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. void diamond1(int n) {
  6.   int i, j;
  7.   for (i = 0; i <= n / 2; ++i) {
  8.     for (j = n / 2 - i; j > 0; --j) {
  9.       printf(" ");
  10.     }
  11.  
  12.     for (j = 0; j < i * 2 + 1; ++j) {
  13.       printf("*");
  14.     }
  15.  
  16.     puts("");
  17.   }
  18.  
  19.   for (i = n / 2 - 1; i >= 0; --i) {
  20.     for (j = n / 2 - i; j > 0; --j) {
  21.       printf(" ");
  22.     }
  23.  
  24.     for (j = 0; j < i * 2 + 1; ++j) {
  25.       printf("*");
  26.     }
  27.  
  28.     puts("");
  29.   }
  30. }
  31.  
  32. void diamond2(int n) {
  33.   int i, j;
  34.  
  35.   for (i = -n / 2; i <= n / 2; ++i) {
  36.     int v = i < 0 ? -1 : 1;
  37.     for (j = 0; j < i * v; ++j) {
  38.       printf(" ");
  39.     }
  40.  
  41.     for (j = 0; j  < n - 2 * i * v; ++j) {
  42.       printf("*");
  43.     }
  44.  
  45.     puts("");
  46.   }
  47. }
  48.  
  49. void diamond3(int n) {
  50.   int i, j;
  51.   char *a = NULL;
  52.   char *s = NULL;
  53.   char *d = NULL;
  54.   a = calloc(n + 1, sizeof(char));
  55.   if (!a) { return; }
  56.   s = calloc(n + 1, sizeof(char));
  57.   if (!s) { goto a_free; }
  58.   d = calloc(n + 1, sizeof(char));
  59.   if (!d) { goto s_free; }
  60.  
  61.   for (i = 0; i < n; ++i) {
  62.     strncat(s, " ", 1);
  63.     strncat(a, "*", 1);
  64.   }
  65.  
  66.   for (i = -n / 2; i <= n / 2; ++i) {
  67.     int v = i < 0 ? -1 : 1;
  68.     memset(d, 0, n + 1);
  69.     strncat(d, s, i * v);
  70.     strncat(d, a, n - 2 * i * v);
  71.     puts(d);
  72.   }
  73.  
  74.   if (d) { free(d); d = NULL; }
  75. s_free:
  76.   if (s) { free(s); s = NULL; }
  77. a_free:
  78.   if (a) { free(a); a = NULL; }
  79. }
  80.  
  81. int main(int argc, char *argv[])
  82. {
  83.   diamond1(5);
  84.   diamond1(7);
  85.   diamond2(5);
  86.   diamond2(7);
  87.   diamond3(5);
  88.   diamond3(7);
  89.   return EXIT_SUCCESS;
  90. }
  91.  
Success #stdin #stdout 0s 1920KB
comments (?)
stdin
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Standard input is empty
stdout
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  *
 ***
*****
 ***
  *
   *
  ***
 *****
*******
 *****
  ***
   *
  *
 ***
*****
 ***
  *
   *
  ***
 *****
*******
 *****
  ***
   *
  *
 ***
*****
 ***
  *
   *
  ***
 *****
*******
 *****
  ***
   *
https://ideone.com/fxaMNL
language:
C (gcc 8.3)
created:
10 years ago
visibility:
secret

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