fork download
copy 
  1. #include <iostream>
  2. #include <ctime>
  3. #include <cmath>
  4. #include <cfloat>
  5.  
  6. const int num_tests = 200000000;
  7.  
  8. int main() {
  9.    double r=0.0;
  10.    clock_t start = clock();
  11.    for(int i=0; i<num_tests; ++i)
  12.        r += i;
  13.    clock_t end = clock();
  14.    std::cout << r << " empty loop took " << double(end-start)/CLOCKS_PER_SEC << "s\n";
  15.  
  16.    r=0;
  17.    start = clock();
  18.    for(int i=0; i<num_tests; ++i)
  19.        r += i*double(FLT_RADIX);
  20.    end = clock();
  21.    std::cout << r << " multiplication loop took " << double(end-start)/CLOCKS_PER_SEC << "s\n";
  22.  
  23.    r=0;
  24.    start = clock();
  25.    for(int i=0; i<num_tests; ++i)
  26.        r += scalbln(i, 1);
  27.    end = clock();
  28.    std::cout << r << " scalbln loop took " << double(end-start)/CLOCKS_PER_SEC << "s\n";
  29.  
  30.    return 0;
  31. }
Success #stdin #stdout 2.06s 2680KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
2e+16 empty loop took 0.37s
4e+16 multiplication loop took 0.36s
4e+16 scalbln loop took 1.32s
https://ideone.com/hekZJ
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!