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  1.     #include <stdio.h>
  2.  
  3.     #define CONCAT(S1,C,S2) ({ \
  4.         static const struct __attribute__ ((packed)) { \
  5.           char s1[sizeof (S1) - 1]; \
  6.           char c; \
  7.           char s2[sizeof (S2)]; \
  8.         } _r = { (S1), (C), (S2) }; \
  9.         (const char *) &_r; \
  10.     })
  11.  
  12.     int
  13.     main (void)
  14.     {
  15.       puts (CONCAT ("abc", 'd', "efg"));
  16.       return 0;
  17.     }
Success #stdin #stdout 0.01s 1720KB
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stdin
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Standard input is empty
stdout
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abcdefg
https://ideone.com/lzEAn
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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