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  1. #include <stdio.h>
  2.  
  3. #define IS_SIGNED_TYPE(type) ((type)0 > (type)-1)
  4.  
  5. #define IS_SIGNED_VAR(x) _Generic((x), \
  6.         unsigned char:      IS_SIGNED_TYPE(unsigned char), \
  7.         char:               IS_SIGNED_TYPE(char), \
  8.         signed char:        IS_SIGNED_TYPE(signed char), \
  9.         short:              IS_SIGNED_TYPE(short), \
  10.         unsigned short:     IS_SIGNED_TYPE(unsigned short), \
  11.         int:                IS_SIGNED_TYPE(int), \
  12.         unsigned:           IS_SIGNED_TYPE(unsigned), \
  13.         long:               IS_SIGNED_TYPE(long), \
  14.         unsigned long:      IS_SIGNED_TYPE(unsigned long), \
  15.         long long:          IS_SIGNED_TYPE(long long), \
  16.         unsigned long long: IS_SIGNED_TYPE(unsigned long long), \
  17.         float:              IS_SIGNED_TYPE(float), \
  18.         double:             IS_SIGNED_TYPE(double), \
  19.         long double:        IS_SIGNED_TYPE(long double), \
  20.         void*:              IS_SIGNED_TYPE(void*), \
  21.         default:            0) 
  22.  
  23. int main()
  24. {
  25.     unsigned char s;
  26.     printf("%d\n", IS_SIGNED_VAR(s));
  27.     printf("%d\n", IS_SIGNED_VAR(42));
  28.     printf("%d\n", IS_SIGNED_VAR(100u)); 
  29. }
Success #stdin #stdout 0s 2112KB
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https://ideone.com/yOUPTs
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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