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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. #define smth
  5.  
  6. int main() {
  7.  
  8.     #ifdef smth
  9.         puts("smth is defined");
  10.     #elseif 
  11.         puts("smth is not defined");
  12.     #endif
  13.  
  14.     #ifndef smth // #ifnfed = !ifdef
  15.         puts("smth is not defined");
  16.     #elseif 
  17.         puts("smth is defined");
  18.     #endif
  19.     return 0;
  20. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp:10:6: error: invalid preprocessing directive #elseif
     #elseif 
      ^
stdout
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Standard output is empty
https://ideone.com/AaH2tv
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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