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  1. #include <stdio.h>
  2.  
  3. struct {
  4.     struct {
  5.         struct {
  6.             char string[128];
  7.             char *string_as_charpointer;
  8.             char string_as_chararray[];
  9.         } log;
  10.     } msg;
  11. } m;
  12.  
  13. size_t sizeof_wrapper(char string_as_chararray[]) {
  14.     return sizeof(string_as_chararray);
  15. }
  16.  
  17. int main(void) {
  18.     printf("char[128]: %zu\n", sizeof(m.msg.log.string));
  19.     printf("char*: %zu\n", sizeof(m.msg.log.string_as_charpointer));
  20.     //printf("char[]: %zu\n", sizeof(m.msg.log.string_as_chararray)); // errors out with "invalid application of ‘sizeof’ to incomplete type ‘char[]’"
  21.     printf("char[] via wrapper: %zu\n", sizeof_wrapper(m.msg.log.string));
  22.     return 0;
  23. }
  24.  
Success #stdin #stdout 0s 4564KB
comments (?)
stdin
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Standard input is empty
stdout
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char[128]: 128
char*: 8
char[] via wrapper: 8
https://ideone.com/1YQUTV
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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