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  1. #include <stdio.h>
  2.  
  3. #define COUNT(type, result_m, result_e) do { \
  4.   type x = 1, exp; \
  5.   unsigned res, e; \
  6.   for (res=0; x!=0; ++res) x/=2.; \
  7.   for (exp=1,e=0; exp*2<res; ++e) exp*=2; \
  8.   *result_e = e+1; \
  9.   *result_m = res-exp+1; \
  10. } while(0)
  11.  
  12. int main(void)
  13. {
  14.   unsigned f_m, f_e, d_m, d_e, ld_m, ld_e;
  15.  
  16.   COUNT(float, &f_m, &f_e);
  17.   COUNT(double, &d_m, &d_e);
  18.   COUNT(long double, &ld_m, &ld_e);
  19.  
  20.   printf("              S   M   E   SZ\n");
  21.   printf("float:        1  %2u  %2u  %3u\n",  f_m,  f_e, 8 * sizeof(float));
  22.   printf("double:       1  %2u  %2u  %3u\n",  d_m,  d_e, 8 * sizeof(double));
  23.   printf("long double:  1  %2u  %2u  %3u\n", ld_m, ld_e, 8 * sizeof(long double));
  24. }
  25.  
Success #stdin #stdout 0s 9416KB
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stdin
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Standard input is empty
stdout
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              S   M   E   SZ
float:        1  23   8   32
double:       1  52  11   64
long double:  1  63  15  128
https://ideone.com/YuIWNc
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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