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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <time.h>
  4.  
  5. #define DIGITS 4
  6.  
  7. int question[DIGITS];                        /* store the 4 digits of the question */
  8. void generateQuestion();         
  9. void guess(int your_answer[]);   
  10. int compare(int your_answer[]);  
  11.  
  12. int main()
  13. {
  14. 	int your_answer[DIGITS];                  /* your_answer is for user input. */
  15. 	int is_correct;                      /* is_correct is to check whether the user entered the correct number. */
  16. 	generateQuestion();
  17. 	printf("Enter 4 different digits with the first digit nonzero.\n");
  18.  
  19. 	do{
  20. 	   guess(your_answer);
  21. 	   is_correct = compare(your_answer);
  22. 	}while(is_correct == 0);
  23.  
  24. 	printf("congratulation! \nYou guessed correct number!\n");
  25.  
  26. 	system("pause");
  27. 	return 0;
  28. }
  29.  
  30. /* randomly generate 4 digits without repeation. */
  31. void generateQuestion()
  32. {
  33. 	int is_repeat;                     /* for check whether we generate the repeated digit. */
  34. 	int i, j;
  35. 	srand( time(NULL) );
  36.  
  37. 	question[0] = rand() % 9 + 1;      /* the first digit should be 1-9 */
  38.  
  39. 	/* generate the other 3 digits. */
  40. 	for(i = 1; i < DIGITS; i++){
  41. 		/* generate the new digit until no repeated value occurred. */
  42. 		do{
  43. 			is_repeat = 0;             /* suppose we do not generate repeated digit. */
  44. 		    question[i] = rand() % 10; /* the other digit can be 0-9. */
  45. 	        for(j = 0; j < i; j++){
  46. 		        if(question[i] == question[j]){
  47. 			       is_repeat = 1;     /* repeation occurred. */
  48. 			       break;
  49. 		        }
  50. 	       }
  51. 	   }while(is_repeat == 1);
  52. 	}
  53.  
  54. 	/* display the generated four digits to make debug convenient, so
  55. 	   you can remove the printf statement.
  56. 	*/
  57. 	printf("%d%d%d%d\n", question[0], question[1], question[2], question[3]);
  58. }
  59.  
  60. /* get the number the user guessed and store it into your_answer */
  61. void guess(int your_answer[])
  62. {
  63. 	int value, i;
  64. 	scanf("%d", &value);    /* view the four digits as a number. */
  65.  
  66. 	/* store the four digits. */
  67. 	for(i = DIGITS-1; i >=0; i--){
  68. 		your_answer[i] = value % 10;
  69. 		value = value / 10;
  70. 	}
  71. }
  72.  
  73. /* compare the question with the user input number
  74.    if the user guessed the correct number, return 1.
  75.    otherwise, return 0.
  76. */
  77.  
  78. int compare(int your_answer[])
  79. {
  80. 	int a_count = 0, b_count = 0, i, j;
  81.  
  82. 	for(i = 0; i < DIGITS; i++){
  83. 		if(your_answer[i] == question[i]){
  84. 			a_count++;
  85. 		}
  86. 		else{
  87. 			for(j = 0; j < DIGITS; j++){
  88. 				if(your_answer[i] ==  question[j] && j != i){
  89. 					b_count++;
  90. 					break;
  91. 				}
  92. 			}
  93. 		}
  94. 	}
  95.  
  96.     printf("%d A %d B\n", a_count, b_count);
  97.  
  98. 	if(a_count == 4)
  99. 		return 1;
  100. 	else{
  101. 		printf("Try again.\n");
  102. 		return 0;
  103. 	}
  104. }
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https://ideone.com/Z6oMR
language:
C (gcc 8.3)
created:
13 years ago
visibility:
public

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