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  1. # include <stdio.h>
  2.  
  3. #define ISNEG(X) (!((X) > 0) && ((X) != 0))
  4.  
  5.  
  6. void
  7. display_result(int arg, int result)
  8. {
  9.   printf("ISNEG(%d) is %stive\n", arg, (result ? "nega" : "posi"));
  10. }
  11.  
  12. void
  13. display_uresult(unsigned int arg, int result)
  14. {
  15.   printf("ISNEG(%u) is %stive\n", arg, (result ? "nega" : "posi"));
  16. }
  17.  
  18. int main ()
  19. {
  20.   short shrt =  5;
  21.   short nshrt = -5;
  22.   unsigned short ushrt = 5;
  23.  
  24.   display_result(shrt, ISNEG(shrt));
  25.   display_result(nshrt, ISNEG(nshrt));
  26.   display_uresult(ushrt, ISNEG(ushrt));
  27.  
  28.   int ni = -5;
  29.   int i = 5;
  30.   int zero = 0;
  31.  
  32.   display_result(ni, ISNEG(ni));
  33.   display_result(i, ISNEG(i));
  34.   display_result(zero, ISNEG(zero));
  35.   display_result(~zero, ISNEG(~zero));  // wrong
  36.  
  37.   unsigned int uzero = 0;
  38.   unsigned int ui = 5;
  39.  
  40.   display_uresult(uzero, ISNEG(uzero));
  41.   display_uresult(~uzero, ISNEG(~uzero));
  42.   display_uresult(ui, ISNEG(ui));
  43.  
  44.   long int li = -5;
  45.   unsigned long int uli = 5;
  46.  
  47.   display_result(li, ISNEG(li));
  48.   display_uresult(uli, ISNEG(uli));
  49.  
  50.   long long int lli = -5;
  51.   unsigned long long int ulli = 5;
  52.  
  53.   display_result(lli, ISNEG(lli));
  54.   display_uresult(ulli, ISNEG(ulli));
  55.  
  56.   return 0;
  57. }
Success #stdin #stdout 0s 2248KB
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stdin
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Standard input is empty
stdout
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ISNEG(5) is positive
ISNEG(-5) is negative
ISNEG(5) is positive
ISNEG(-5) is negative
ISNEG(5) is positive
ISNEG(0) is positive
ISNEG(-1) is negative
ISNEG(0) is positive
ISNEG(4294967295) is positive
ISNEG(5) is positive
ISNEG(-5) is negative
ISNEG(5) is positive
ISNEG(-5) is negative
ISNEG(5) is positive
https://ideone.com/hX98E5
language:
C99 (gcc 8.3)
created:
10 years ago
visibility:
public

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