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  1. /******************************************************************************
  2. Author: Deepank Korandla
  3. Date: May 25, 2016
  4. Effort: 15 minutes
  5. Purpose: This assignment allows the student to get further practice with
  6. bitwise operators and exposes them to the idea of creating a cohesive set of
  7. functions for interacting with an object type.
  8. ******************************************************************************/
  9.  
  10. #include <stdio.h>
  11.  
  12. void set_flag(unsigned int flag_holder[], int flag_position);
  13. void unset_flag(unsigned int flag_holder[],	int flag_position);
  14. int check_flag(unsigned int flag_holder[], int flag_position);
  15. void display_32_flags_as_array(unsigned int flag_holder);
  16. void display_flags(unsigned int flag_holder[], int size);
  17.  
  18. int main(int argc, char* argv[]){
  19. 	//Set the first integer to zero and all others to zero by default.
  20. 	unsigned int flag_holder[5] = { 0 };
  21.  
  22. 	set_flag(flag_holder, 3);
  23. 	set_flag(flag_holder, 16);
  24. 	set_flag(flag_holder, 31);
  25. 	set_flag(flag_holder, 87);
  26.  
  27. 	display_flags(flag_holder, 5);
  28. 	printf("\n\n");
  29.  
  30. 	unset_flag(flag_holder, 31);
  31. 	unset_flag(flag_holder, 3);
  32. 	set_flag(flag_holder, 99);
  33. 	set_flag(flag_holder, 100);
  34.  
  35. 	display_flags(flag_holder, 5);
  36. 	return 0;
  37. }
  38.  
  39. void set_flag(unsigned int flag_holder[], int flag_position){
  40. 	int arrayIndex, bitPosition, checker;
  41. 	int maxBits = 32;
  42.  
  43. 	if (flag_position < maxBits) {
  44. 		arrayIndex = 0;
  45. 		bitPosition = flag_position;
  46. 	} else {
  47. 		arrayIndex = flag_position / maxBits;
  48. 		bitPosition = flag_position % maxBits;
  49. 	}
  50.  
  51. 	checker = 1 << (bitPosition - 1);
  52.  
  53. 	if ((flag_holder[arrayIndex] & checker) != checker) {
  54. 		flag_holder[arrayIndex] = flag_holder[arrayIndex] + checker;
  55. 	}
  56. }
  57.  
  58. void unset_flag(unsigned int flag_holder[], int flag_position){
  59. 	int arrayIndex, bitPosition, checker;
  60. 	int maxBits = 32;
  61.  
  62. 	if (flag_position < maxBits) {
  63. 		arrayIndex = 0;
  64. 		bitPosition = flag_position;
  65. 	} else {
  66. 		arrayIndex = flag_position / maxBits;
  67. 		bitPosition = flag_position % maxBits;
  68. 	}
  69.  
  70. 	checker = 1 << (bitPosition - 1);
  71.  
  72. 	if ((flag_holder[arrayIndex] & checker) == checker) {
  73. 		flag_holder[arrayIndex] = flag_holder[arrayIndex] - checker;
  74. 	}
  75. }
  76.  
  77. int check_flag(unsigned int flag_holder[], int flag_position){
  78. 	int arrayIndex, bitPosition, checker;
  79. 	int maxBits = 32;
  80.  
  81. 	if (flag_position < maxBits) {
  82. 		arrayIndex = 0;
  83. 		bitPosition = flag_position;
  84. 	} else {
  85. 		arrayIndex = flag_position / maxBits;
  86. 		bitPosition = flag_position % maxBits;
  87. 	}
  88.  
  89. 	checker = flag_holder[arrayIndex] >> (bitPosition - 1);
  90.  
  91. 	return (checker & 1);
  92. }
  93.  
  94. void display_32_flags_as_array(unsigned int flag_holder){
  95. 	int tempArray[1] = { flag_holder };
  96. 	int maxBits = 32;
  97. 	int i;
  98.  
  99. 	for (i = 0; i < maxBits; i = i + 1) {
  100. 		printf("%d", check_flag(tempArray, i));
  101.  
  102. 		if (i % 4 == 0) {
  103. 			printf(" ");
  104. 		}
  105. 	}
  106. }
  107.  
  108. void display_flags(unsigned int flag_holder[], int size){
  109. 	int i;
  110.  
  111. 	for (i = 0; i < size; i = i + 1) {
  112. 		display_32_flags_as_array(flag_holder[i]);
  113. 		printf("\n");
  114. 	}
  115. }
Success #stdin #stdout 0s 5520KB
comments (?)
stdin 
Standard input is empty
stdout 
0 0010 0000 0000 0001 0000 0000 0000 001
0 0000 0000 0000 0000 0000 0000 0000 000
0 0000 0000 0000 0000 0000 0010 0000 000
0 0000 0000 0000 0000 0000 0000 0000 000
0 0000 0000 0000 0000 0000 0000 0000 000


0 0000 0000 0000 0001 0000 0000 0000 000
0 0000 0000 0000 0000 0000 0000 0000 000
0 0000 0000 0000 0000 0000 0010 0000 000
0 0011 0000 0000 0000 0000 0000 0000 000
0 0000 0000 0000 0000 0000 0000 0000 000
https://ideone.com/cjRZja
language:
C (gcc 8.3)
created:
2 years ago
visibility:
public

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