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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. #include<string.h>
  4.  
  5. struct SSS {
  6.     char dummy[256];
  7.     int num;
  8. };
  9.  
  10. void print_data1(struct SSS *d, char *name)
  11. {
  12.     printf("%s = { [0]%d, [1]%d }\n", name, d[0].num, d[1].num);
  13. }
  14.  
  15. void print_data2(struct SSS **d, char *name)
  16. {
  17.     printf("%s = { [0]%d, [1]%d }\n", name, d[0]->num, d[1]->num);
  18. }
  19.  
  20. int main()
  21. {
  22.     struct SSS s1[2];
  23.     struct SSS *s2;
  24.     struct SSS **s3;
  25.  
  26.     // s1
  27.     memset(s1, 0xFF, sizeof(s1));
  28.     s1[0].num = 10;
  29.     s1[1].num = 11;
  30.     print_data1(s1, "s1");
  31.  
  32.     // s2
  33.     s2 = (struct SSS *) malloc(sizeof(struct SSS) * 2);
  34.     memset(s2, 0xFF, sizeof(struct SSS) * 2);
  35.     s2[0].num = 20;
  36.     s2[1].num = 21;
  37.     print_data1(s2, "s2");
  38.  
  39.     // s3
  40.     s3 = (struct SSS **) malloc(sizeof(struct SSS *) * 2);
  41.     s3[0] = (struct SSS *) malloc(sizeof(struct SSS));
  42.     s3[1] = (struct SSS *) malloc(sizeof(struct SSS));
  43.     s3[0]->num = 30;
  44.     s3[1]->num = 31;
  45.     print_data1( s3, "s3(×)");
  46.     print_data1(*s3, "s3(×)");
  47.     print_data2( s3, "s3(○)");
  48.  
  49.     return 0;
  50. }
  51.  
Success #stdin #stdout 0.02s 1808KB
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stdin
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Standard input is empty
stdout
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s1 = { [0]10, [1]11 }
s2 = { [0]20, [1]21 }
s3(×) = { [0]0, [1]0 }
s3(×) = { [0]30, [1]0 }
s3(○) = { [0]30, [1]31 }
https://ideone.com/GkZdrC
language:
C (gcc 8.3)
created:
11 years ago
visibility:
secret

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