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  1. /*
  2. OVERVIEW: 	Given date of births of two persons as inputs, return 1 if person one is elder,
  3. 2 if person two is elder, 0 if both are of same age.
  4. Example: isOlder("24-07-2000", "25-07-2000") should return 1 as person one
  5. is elder than person two.
  6.  
  7. INPUTS: 	DOBs of two persons as parameters in the format "DD-MM-YYYY".
  8.  
  9. OUTPUT: 	1 if person one is elder, 2 if person two is elder, 0 if both are of same age.
  10.  
  11. ERROR CASES: Return -1 if any DOB is invalid.
  12.  
  13. NOTES: 		Don't use any built-in C functions for comparisions. You are free to write any helper functions.
  14. */
  15. #include<stdio.h>
  16. #include<stdlib.h>
  17. void popuplate_parts(char* dob1,char *d,char *m, char *y){
  18. 	int i = 0,j=0;
  19. 	//copy first characters in d array
  20. 	for (i = 0; i < 2;i++,j++){
  21. 		d[i] = dob1[j];  
  22. 	}
  23. 	d[i] = '\0';
  24. 	j++; //skip "-"
  25.  
  26. 	//copy next 2 characters after - in m array
  27. 	for (i = 0; i < 2;i++,j++){
  28. 		m[i] = dob1[j];
  29. 	}
  30. 	m[i] = '\0';
  31. 	j++; //skip "-"
  32.  
  33. 	//copy next 4 characters after - in y array
  34. 	for (i = 0; i < 4;i++,j++){
  35. 		y[i] = dob1[j];
  36. 	}
  37. 	y[i] = '\0';
  38. }
  39. int isOlder(char *dob1, char *dob2) {
  40. 	char date1[3];
  41. 	char date2[3];
  42. 	char month1[3];
  43. 	char month2[3];
  44. 	char year1[5];
  45. 	char year2[5];
  46. 	int d1, m1, y1, d2, m2, y2;
  47. 	popuplate_parts(dob1, date1, month1, year1);
  48. 	//now we have extracted all parts from dob1
  49. 	//printf("d=%s m=%s y=%s",date1,month1,year1);
  50. 	//make them integers now 
  51. 	d1 = atoi(date1);
  52. 	m1 = atoi(month1);
  53. 	y1 = atoi(year1);
  54.  
  55. 	popuplate_parts(dob2, date2, month2, year2);
  56. 	//printf("d=%s m=%s y=%s", date1, month1, year1);
  57. 	d2 = atoi(date2);
  58. 	m2 = atoi(month2);
  59. 	y2 = atoi(year2);
  60.  
  61. 	if(d1<=0||d1>31||d2<=0||d2>31||m1<=0||m1>12||m2<=0||m2>12){
  62. 		return -1;
  63. 	}
  64. 	if(y1>y2){
  65. 		return 2;
  66. 	}else if(y2>y1){
  67. 		return 1;
  68. 	}else{
  69. 		if(m1>m2){
  70. 		return 2;
  71. 	}else if(m2>m1){
  72. 		return 1;
  73. 	}else {
  74. 		if(d1>d2){
  75. 			return 2;
  76. 		}else if(d2>d1){
  77. 			return 1;
  78. 		}else{
  79. 			return 0;
  80. 		}
  81. 	}
  82.  
  83.  
  84. 	}
  85. 	return 0;
  86. }
  87. int  main(){
  88. 	printf("1 means person 1 is elder, 2 means person2 is elder, 0 means both are of same age, -1 means wrong date entered\n");
  89. 	printf("%d\n",isOlder("23-11-2001", "25-12-2003"));
  90. 	printf("%d\n",isOlder("23-11-2011", "25-12-2003"));
  91. 	printf("%d\n",isOlder("23-11-2001", "23-11-2001"));
  92. 	printf("%d\n",isOlder("23-11-2001", "25-13-2003"));
  93. 	return 0;
  94. }
Success #stdin #stdout 0s 9432KB
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Standard input is empty
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1 means person 1 is elder, 2 means person2 is elder, 0 means both are of same age, -1 means wrong date entered
1
2
0
-1
https://ideone.com/ZSdHnY
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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