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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <time.h>
  4. #include <string.h>
  5. int main()
  6. {
  7. 	int i, j, ansChoice, selectedChoice, knownWrongChoice, oldSelectedChoice;
  8. 	int result[2]={ 0 };
  9.  
  10. 	//plant a seed
  11. 	srand( time(NULL) );
  12. 	for( j = 0 ; j < 10 ; j++ )
  13. 	{
  14. 		result[0] = result [1] = 0;
  15. 		for ( i = 0; i < 100000 ; i++ )
  16. 		{
  17. 			do
  18. 			{
  19. 				//random right choice
  20. 				ansChoice = rand() % 4;
  21.  
  22. 				// now give a selected choice
  23. 				selectedChoice = rand() % 4;
  24.  
  25. 				//let think of some wrong choice 
  26. 				do{
  27. 					knownWrongChoice = rand() % 4;
  28. 				}while( knownWrongChoice == ansChoice );
  29.  
  30. 			//if selected choice is known to be wrong, don't count this question
  31. 			}while( knownWrongChoice == selectedChoice );
  32.  
  33. 			//if we confirm that choice.
  34. 			if( selectedChoice == ansChoice)
  35. 				result[0]++;
  36.  
  37. 			//if we change  random new selected choice.
  38. 			oldSelectedChoice = selectedChoice;
  39. 			do{
  40. 				selectedChoice = rand() % 4;
  41. 			}while( selectedChoice == knownWrongChoice || oldSelectedChoice == selectedChoice );
  42.  
  43. 			//collect result
  44. 			if( selectedChoice == ansChoice)
  45. 				result[1]++;
  46.  
  47.  
  48.  
  49. 		}
  50.  
  51. 		//print
  52. 		printf("\n%d\nnochange = %d (%.2f) \nchange = %d (%.2f)\n from %d times",j,
  53. 			result[0] , ((float)result[0]/i)*100 ,
  54. 			 result[1] , ((float)result[1]/i)*100 , i );
  55. 	}
  56. 	return 0;
  57. }
  58.  
Success #stdin #stdout 0.2s 2724KB
comments ()
stdin
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Standard input is empty
stdout
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0
nochange = 33349 (33.35) 
change = 33329 (33.33)
 from 100000 times
1
nochange = 33230 (33.23) 
change = 33339 (33.34)
 from 100000 times
2
nochange = 33355 (33.35) 
change = 33176 (33.18)
 from 100000 times
3
nochange = 33259 (33.26) 
change = 33406 (33.41)
 from 100000 times
4
nochange = 33619 (33.62) 
change = 33046 (33.05)
 from 100000 times
5
nochange = 33318 (33.32) 
change = 33315 (33.31)
 from 100000 times
6
nochange = 33395 (33.40) 
change = 33433 (33.43)
 from 100000 times
7
nochange = 33234 (33.23) 
change = 33226 (33.23)
 from 100000 times
8
nochange = 33164 (33.16) 
change = 33376 (33.38)
 from 100000 times
9
nochange = 33235 (33.23) 
change = 33457 (33.46)
 from 100000 times
https://ideone.com/JhoKB
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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