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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 , ansDoor,selectedDoor,openedDoor, oldSelectedDoor;
  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.  
  18. 			//random right door
  19. 			ansDoor = rand() % 4;
  20.  
  21. 			// now give a selected door
  22. 			selectedDoor = rand() % 4;
  23.  
  24. 			//if we confirm that door.
  25. 			if( selectedDoor == ansDoor)
  26. 				result[0]++;
  27.  
  28. 			//collect result
  29. 			if( selectedDoor != ansDoor)
  30. 				result[1]++;
  31.  
  32.  
  33.  
  34. 		}
  35.  
  36. 		//print
  37. 		printf("\n%d\nnochange = %d (%.2f) \nchange = %d (%.2f)\n from %d times",j,
  38. 			result[0] , ((float)result[0]/i)*100 ,
  39. 			 result[1] , ((float)result[1]/i)*100 , i );
  40. 	}
  41. 	return 0;
  42. }
Success #stdin #stdout 0.07s 2680KB
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stdin
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Standard input is empty
stdout
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0
nochange = 25042 (25.04) 
change = 74958 (74.96)
 from 100000 times
1
nochange = 24916 (24.92) 
change = 75084 (75.08)
 from 100000 times
2
nochange = 24780 (24.78) 
change = 75220 (75.22)
 from 100000 times
3
nochange = 24792 (24.79) 
change = 75208 (75.21)
 from 100000 times
4
nochange = 24954 (24.95) 
change = 75046 (75.05)
 from 100000 times
5
nochange = 25148 (25.15) 
change = 74852 (74.85)
 from 100000 times
6
nochange = 24885 (24.89) 
change = 75115 (75.11)
 from 100000 times
7
nochange = 25123 (25.12) 
change = 74877 (74.88)
 from 100000 times
8
nochange = 25128 (25.13) 
change = 74872 (74.87)
 from 100000 times
9
nochange = 24864 (24.86) 
change = 75136 (75.14)
 from 100000 times
https://ideone.com/OrZB2
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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