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  1. #include <stdio.h>  
  2.  
  3. int func()  
  4. {
  5.     return(printf("Hello world"));
  6. }
  7.  
  8. int main()  
  9. {
  10.     printf("%zu",sizeof(func));
  11.     return 0;  
  12. }
  13.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments ()
stdin
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Standard input is empty
compilation info 
prog.c: In function 'main':
prog.c:10:24: error: invalid application of 'sizeof' to a function type [-Werror=pointer-arith]
     printf("%zu",sizeof(func));
                        ^
cc1: all warnings being treated as errors
stdout
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Standard output is empty
https://ideone.com/crjdVL
language:
C99 (gcc 8.3)
created:
8 years ago
visibility:
public

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