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  1. #include <ctype.h>
  2. #include <stddef.h>
  3. #include <stdio.h>
  4.  
  5. int main(void)
  6. {
  7.     char ca[10] = {[4] = 'e', [0] = 'a', [2] = 'c', [1] = 'b', [3] = 'd', [9] = 'z'};
  8.  
  9.     //         0    1    2    3    4   . . . . . .  9
  10.     // ca == {'a', 'b', 'c', 'd', 'e', 0, 0, 0, 0, 'z'}
  11.  
  12.     printf("Contents of ca:\n  ");
  13.  
  14.     // the zeros are not printable, because they aren't the '0' character,
  15.     // so we need to cast them to int so as to print their numeric value
  16.     for (size_t i=0; i < sizeof ca; ++i)
  17.         if (isprint(ca[i]))
  18.             printf("%c ", ca[i]);
  19.         else
  20.             printf("%d ", (int)ca[i]);
  21.  
  22.     printf("\n\n");
  23.  
  24.     struct Test
  25.     {
  26.         char    c;
  27.         int     i;
  28.         float   f;
  29.     };
  30.  
  31.     struct Test t = {/*.f = 3.14f,*/ .c = 'Z', .i = 10};  // <==>struct Test t = { 3.14f, 'Z' ,  };
  32.  
  33.     printf("Contents of t:\n  c == %c\n  i == %d\n  f == %f\n", t.c, t.i, t.f);
  34. }
  35.  
Success #stdin #stdout 0s 2248KB
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stdin
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Standard input is empty
stdout
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Contents of ca:
  a b c d e 0 0 0 0 z 

Contents of t:
  c == Z
  i == 10
  f == 0.000000
https://ideone.com/frzjCD
测试Designated initializers
language:
C99 (gcc 8.3)
created:
11 years ago
visibility:
public

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