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  1. #include <iostream>
  2. #include <string>
  3. #include <sstream>
  4.  
  5. std::string printSizeApproximately(uint64_t n) {
  6.                                   /* 0 */               /* 1 */             /* 2 */             /* 3 */             /* 4 */
  7.   static std::string Suffix[] = { std::string("Bytes"), std::string("KiB"), std::string("MiB"), std::string("GiB"), std::string("TiB") };
  8.   uint64_t t = n;
  9.   uint64_t s = 1;
  10.   uint64_t r;
  11.   int i = 0;
  12.   for (;;) {
  13.     r = t;
  14.     t >>= 10;
  15.  
  16.     /* out of loop : 2 conditions */
  17.     if (t == 0)
  18.       break;
  19.     if (i == 4)
  20.       break;
  21.  
  22.     s <<= 10;
  23.     i++;
  24.   }
  25.   std::stringstream ss;
  26.   if (i == 0) {
  27.     ss << n << " " << Suffix[i];
  28.   } else {
  29.     if (r >= 1 && r < (int)(1024 / 100.0)) { /* 1.52KiB */
  30.       ss << (int)(n * 100.0 / s) / 100.0 << ' ' << Suffix[i];
  31.     } else if (r >= (int)(1024 / 100.0) && r < (int)(1024 / 10.0)) { /* 15.2KiB */
  32.       ss << (int)(n * 10.0 / s) / 10.0 << ' ' << Suffix[i];
  33.     } else { /* r >= (int)(1024 / 10.0  152KiB */
  34.       ss << (int)((double)n / s) << ' ' << Suffix[i];
  35.     }
  36.   }
  37.   std::string output_s = ss.str();
  38.   return output_s;
  39. }
  40.  
  41. int main() {
  42.   uint64_t n;
  43.   n = 555; std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl;
  44.   n = 1123; std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl; /* KiB */
  45.   n = 18234; std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl;
  46.   n = 252344; std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl;
  47.   n = 3252344; std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl;  /* MiB */
  48.   n = 73241344; std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl;
  49.   n = 697351323;  std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl;
  50.   n = 9697351323;  std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl; /* GiB */
  51.   n = 39697351323;  std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl;
  52.   n = 439697351323;  std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl;
  53.   n = 6439697351323;  std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl; /* TiB */
  54.   n = 36439697351323;  std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl;
  55.   n = 236439697351323;  std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl;
  56.   n = 8236439697351323;  std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl;
  57.   n = 38236439697351323;  std::cout << "n = " << n << " : " << printSizeApproximately(n) << std::endl;
  58.   return 0;
  59. }
  60. /* end */
  61.  
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
Standard input is empty
stdout 
n = 555 : 555 Bytes
n = 1123 : 1.09 KiB
n = 18234 : 17.8 KiB
n = 252344 : 246 KiB
n = 3252344 : 3.1 MiB
n = 73241344 : 69.8 MiB
n = 697351323 : 665 MiB
n = 9697351323 : 9.03 GiB
n = 39697351323 : 36.9 GiB
n = 439697351323 : 409 GiB
n = 6439697351323 : 5.85 TiB
n = 36439697351323 : 33.1 TiB
n = 236439697351323 : 215 TiB
n = 8236439697351323 : 7490 TiB
n = 38236439697351323 : 34775 TiB
https://ideone.com/HfXZiA
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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