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  1. #include <iostream>
  2. #include <iomanip>
  3. using namespace std;
  4.  
  5. unsigned long timeAdd (unsigned long x, unsigned long y) {
  6.   // no sanity checking of input
  7.   // format is hhmmssff with ff being decimal fractions of a second
  8.   // "out of range" results are e.g. A0000000 for 100 hours
  9.   unsigned long binsum = x + y;
  10.   unsigned long carry = ((binsum + 0x06A6A666) ^ x ^ y) & 0x11111110;
  11.   return (binsum + ((carry - (carry>>4)) & 0x06A6A666)); 
  12. }
  13.  
  14. unsigned long timeSub (unsigned long x, unsigned long y) {
  15.   // no sanity checking of input
  16.   // format is hhmmssff with ff being decimal fractions of a second
  17.   // "negative" results are e.g. F9595999 for -0.01 second
  18.   unsigned long bindiff = x - y;
  19.   unsigned long borrow = (bindiff ^ x ^ y) & 0x11111110;
  20.   return (bindiff - ((borrow - (borrow>>4)) & 0x06A6A666) );
  21. }
  22.  
  23.  
  24. int main() {
  25. 	//                     hhmmssff     
  26. 	unsigned long t    = 0x00000000;
  27. 	unsigned long u    = 0x00000000;
  28. 	unsigned long v    = 0x01234567;
  29. 	unsigned long step = 0x00000001;
  30. 	unsigned long i;
  31. 	for (i=1; i<=502567; i++) {
  32. 	  t = timeAdd(t, step);
  33. 	  u = timeAdd(step, u);
  34. 	  v = timeSub(v, step);
  35. 	  if (t!=u) cout << "ERROR I " << i << "\n";
  36. 	  if (timeAdd(u, v)!=0x01234567) cout << "ERROR II " << i << "\n";
  37. 	  if (timeSub(0x01234567, u)!=v) cout << "ERROR III " << i << "\n";
  38. 	  if (i > 502557) {
  39. 	  	cout << hex << setw(8) << t << " ";
  40. 	  	cout << hex << setw(8) << u << " ";
  41. 	  	cout << hex << setw(8) << v << "\n";
  42. 	  }	
  43. 	}
  44.  
  45. 	// your code goes here
  46. 	return 0;
  47. }
Success #stdin #stdout 0s 3412KB
comments (?)
stdin 
Standard input is empty
stdout 
 1234558  1234558        9
 1234559  1234559        8
 1234560  1234560        7
 1234561  1234561        6
 1234562  1234562        5
 1234563  1234563        4
 1234564  1234564        3
 1234565  1234565        2
 1234566  1234566        1
 1234567  1234567        0
https://ideone.com/p6Cn6M
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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