fork download
copy 
  1. #include <cstdint>
  2. #include <iostream>
  3. #include <limits>
  4.  
  5. using namespace std;
  6.  
  7. static uint32_t current_time = numeric_limits<uint32_t>::max() - 1000;
  8.  
  9. uint32_t millis() {
  10. 	return current_time;
  11. }
  12.  
  13. void advance_time(uint32_t amount) {
  14. 	cout << "... time advances by " << amount << "ms ..." << endl;
  15. 	current_time += amount;
  16. }
  17.  
  18. int main() {
  19. 	uint32_t curr_millis = millis();
  20. 	cout << "millis() = " << millis() << endl;
  21.  
  22. 	uint32_t next_gps_update = millis() + 1000;
  23. 	cout << "next_gps_update = millis() + 1000 = " << next_gps_update << " (unsigned: " << uint32_t(next_gps_update) << ")" << endl;
  24.  
  25. 	advance_time(1);
  26.  
  27. 	cout << "millis() = " << millis() << endl;
  28. 	cout << "int32(millis() - next_gps_update) = " << int32_t(millis() - next_gps_update) << endl;
  29. 	cout << "int32(millis() - next_gps_update) >= 0 = " << (int32_t(millis() - next_gps_update) >= 0) << endl;
  30.  
  31. 	advance_time(998);
  32.  
  33. 	cout << "millis() = " << millis() << endl;
  34. 	cout << "int32(millis() - next_gps_update) = " << int32_t(millis() - next_gps_update) << endl;
  35. 	cout << "int32(millis() - next_gps_update) >= 0 = " << (int32_t(millis() - next_gps_update) >= 0) << endl;
  36.  
  37. 	advance_time(10);
  38.  
  39. 	cout << "millis() = " << millis() << endl;
  40. 	cout << "int32(millis() - next_gps_update) = " << int32_t(millis() - next_gps_update) << endl;
  41. 	cout << "int32(millis() - next_gps_update) >= 0 = " << (int32_t(millis() - next_gps_update) >= 0) << endl;
  42.  
  43. 	next_gps_update = millis() + 1000;
  44. 	cout << "next_gps_update = millis() + 1000 = " << next_gps_update << " (unsigned: " << uint32_t(next_gps_update) << ")" << endl;
  45.  
  46. 	advance_time(10);
  47.  
  48. 	cout << "millis() = " << millis() << endl;
  49. 	cout << "int32(millis() - next_gps_update) = " << int32_t(millis() - next_gps_update) << endl;
  50. 	cout << "int32(millis() - next_gps_update) >= 0 = " << (int32_t(millis() - next_gps_update) >= 0) << endl;
  51.  
  52. 	return 0;
  53. }
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
millis() = 4294966295
next_gps_update = millis() + 1000 = 4294967295 (unsigned: 4294967295)
... time advances by 1ms ...
millis() = 4294966296
int32(millis() - next_gps_update) = -999
int32(millis() - next_gps_update) >= 0 = 0
... time advances by 998ms ...
millis() = 4294967294
int32(millis() - next_gps_update) = -1
int32(millis() - next_gps_update) >= 0 = 0
... time advances by 10ms ...
millis() = 8
int32(millis() - next_gps_update) = 9
int32(millis() - next_gps_update) >= 0 = 1
next_gps_update = millis() + 1000 = 1008 (unsigned: 1008)
... time advances by 10ms ...
millis() = 18
int32(millis() - next_gps_update) = -990
int32(millis() - next_gps_update) >= 0 = 0
https://ideone.com/oKWC0C
language:
C++14 (gcc 8.3)
created:
2 days 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!