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  1. #define VAR A
  2.  
  3. #include <cassert>
  4. #include <algorithm>
  5. #include <iterator>
  6. #include <random>
  7. #include <vector>
  8. #include <functional>
  9.  
  10. int signumA(int x) {
  11.   if (x > 0)
  12.      return 1;
  13.   if (x < 0)
  14.      return -1;
  15.   if (x == 0)
  16.      return 0;
  17.   assert(false);
  18. }
  19. int signumB(int x) {
  20.   return (x>0) - (x<0);
  21. }
  22. int signumC(int x) {
  23.   return std::min(std::max(-1, x), 1);
  24. }
  25. int signumD(int x) {
  26.   int y = 0;
  27.   if (x > 0) y = 1;
  28.   if (x < 0) y = -1;
  29.   return y;
  30. }
  31. int signumE(int x) {
  32.   return x ? x/std::abs(x) : 0;
  33. }
  34.  
  35. #define CONCAT2(a, b) a ## b
  36. #define CONCAT(a, b) CONCAT2(a, b)
  37. #define signumX CONCAT(signum, VAR)
  38.  
  39. int main(int argc, const char *argv[]) {
  40.   int length = std::atoi(argv[1]);
  41.   int iterations = std::atoi(argv[2]);
  42.  
  43.   std::mt19937 mersenne_engine(42); // fixed seed
  44.   std::uniform_int_distribution<int> dist(-1000, 1000);
  45.  
  46.   std::vector<int> nums;
  47.   generate_n(back_inserter(nums), length, bind(dist, mersenne_engine));
  48.  
  49.   int signumxor = 0;
  50.   while (iterations--) {
  51.     for (int i : nums)
  52.       signumxor ^= signumX(i);
  53.   }
  54.   return signumxor;
  55. }
  56.  
Runtime error #stdin #stdout 0s 3456KB
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Standard input is empty
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Standard output is empty
https://ideone.com/e0zTTE
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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