Print various values from <limits.h> and <float.h>

limits.c

#include <stdio.h>
#include <stdint.h>
#include <limits.h>
#include <float.h>

void showInt(const char* name, size_t bytes, intmax_t max, intmax_t min,
 uintmax_t umax);

/* Converting between floating-point types undoubtedly won't preserve things
 * appropriately, so showFloat is implemented as a macro: */
#define showFloat(name, form, bytes, sig, dig, epsilon, min, max, minExp, \
 maxExp, min10exp, max10exp) \
 printf(name ":\n Bytes: %zu\t\t\t\t Significand length: %d\n", bytes, sig); \
 printf(" Decimal precision: %-16d\t Epsilon: %.*" form "\n", dig, dig, \
  epsilon); \
 printf(" Minimum: %-30.*" form " Min radix exponent: %d\n", dig, min, \
  minExp); \
 printf(" Maximum: %-30.*" form " Max radix exponent: %d\n", dig, max, \
  maxExp); \
 printf(" Min base 10 exponent: %-16d\t Max base 10 exponent: %d\n\n", \
  min10exp, max10exp);

int main(void) {
#ifdef __STDC_VERSION__
 printf("__STDC_VERSION__ = %ld\n", __STDC_VERSION__);
#else
 puts("!defined(__STDC_VERSION__)");
#endif
 printf("sizeof(void*): %zu\n", sizeof(void*));
 printf("Floating-point radix: %d\n", FLT_RADIX);
#ifdef MB_LEN_MAX
 printf("Max bytes in a multibyte char: %d\n", MB_LEN_MAX);
#else
 puts("!defined(MB_LEN_MAX)");
#endif
 putchar('\n');

 printf("char:\n Bits: %-16d\t\t\t Bytes: %zu\n", CHAR_BIT, sizeof(char));
 printf(" Minimum: %-16d\t\t Signed min: %d\n", CHAR_MIN, SCHAR_MIN);
 printf(" Maximum: %-16d\t\t Signed max: %d\n", CHAR_MAX, SCHAR_MAX);
 printf(" Unsigned max: %d\n\n", UCHAR_MAX);

 showInt("short int", sizeof(short int), SHRT_MAX, SHRT_MIN, USHRT_MAX);
 showInt("int", sizeof(int), INT_MAX, INT_MIN, UINT_MAX);
 showInt("long int", sizeof(long int), LONG_MAX, LONG_MIN, ULONG_MAX);
#if __STDC_VERSION__ >= 199901L
 showInt("long long int", sizeof(long long int), LLONG_MAX, LLONG_MIN,
  ULLONG_MAX);
#endif

/*
 #include <stddef.h>  // ptrdiff_t, size_t, wchar_t
 #include <signal.h>  // sig_atomic_t
 #include <wchar.h>  // wchar_t, wint_t

 showInt("[u]intptr_t", sizeof(intptr_t), INTPTR_MAX, INTPTR_MIN, UINTPTR_MAX);
 showInt("[u]intmax_t", sizeof(intmax_t), INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX);
 showInt("ptrdiff_t", sizeof(ptrdiff_t), PTRDIFF_MAX, PTRDIFF_MIN, 0);
 showInt("sig_atomic_t", sizeof(sig_atomic_t), SIG_ATOMIC_MAX, SIG_ATOMIC_MIN,
  0);
 printf("size_t:\n Bytes: %zu\t\t\t\t Maximum: %zu\n\n", sizeof(size_t),
  SIZE_MAX);
 showInt("wchar_t", sizeof(wchar_t), WCHAR_MAX, WCHAR_MIN, 0);
 showInt("wint_t", sizeof(wint_t), WINT_MAX, WINT_MIN, 0);
*/

 showFloat("float", "g", sizeof(float), FLT_MANT_DIG, FLT_DIG, FLT_EPSILON,
  FLT_MIN, FLT_MAX, FLT_MIN_EXP, FLT_MAX_EXP, FLT_MIN_10_EXP, FLT_MAX_10_EXP);
 showFloat("double", "g", sizeof(double), DBL_MANT_DIG, DBL_DIG, DBL_EPSILON,
  DBL_MIN, DBL_MAX, DBL_MIN_EXP, DBL_MAX_EXP, DBL_MIN_10_EXP, DBL_MAX_10_EXP);
 showFloat("long double", "Lg", sizeof(long double), LDBL_MANT_DIG, LDBL_DIG,
  LDBL_EPSILON, LDBL_MIN, LDBL_MAX, LDBL_MIN_EXP, LDBL_MAX_EXP,
  LDBL_MIN_10_EXP, LDBL_MAX_10_EXP);

 return 0;
}

void showInt(const char* name, size_t bytes, intmax_t max, intmax_t min,
 uintmax_t umax) {
 printf("%s:\n", name);
 printf(" Bytes: %zu", bytes);
 if (umax != 0) printf("\t\t\t\t Unsigned max: %ju", umax);
 printf("\n Minimum: %-30jd Maximum: %jd\n\n", min, max);
}