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  1. #include <cstdio>
  2.  
  3. template <typename typed> void count(unsigned *result_m, unsigned *result_e)
  4. {
  5.   typed x = 1, exp;
  6.   unsigned res, e;
  7.   for (res=0; x!=0; ++res) x/=2;
  8.   for (exp=1,e=0; exp*2<res; ++e) exp*=2;
  9.   *result_e = e+1;
  10.   *result_m = res-exp+1;
  11. }
  12.  
  13. int main(void)
  14. {
  15.   unsigned f_m, f_e, d_m, d_e, ld_m, ld_e;
  16.  
  17.   count<float>(&f_m, &f_e);
  18.   count<double>(&d_m, &d_e);
  19.   count<long double>(&ld_m, &ld_e);
  20.  
  21.   printf("              S   M   E   SZ\n");
  22.   printf("float:        1  %2u  %2u  %3u\n",  f_m,  f_e, 8 * sizeof(float));
  23.   printf("double:       1  %2u  %2u  %3u\n",  d_m,  d_e, 8 * sizeof(double));
  24.   printf("long double:  1  %2u  %2u  %3u\n", ld_m, ld_e, 8 * sizeof(long double));
  25. }
Success #stdin #stdout 0s 15224KB
comments (?)
stdin 
Standard input is empty
stdout 
              S   M   E   SZ
float:        1  23   8   32
double:       1  52  11   64
long double:  1  63  15  128
https://ideone.com/342B4S
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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