From 87761c2c54782588c0a5a7f0a68eabb08407e825 Mon Sep 17 00:00:00 2001
From: Sadeep Madurange <smadurange@users.noreply.github.com>
Date: Wed, 5 Jan 2022 21:38:37 +0800
Subject: 5.9

---
 5/9.c | 36 +++---------------------------------
 1 file changed, 3 insertions(+), 33 deletions(-)

(limited to '5/9.c')

diff --git a/5/9.c b/5/9.c
index 5bcd213..62459fd 100644
--- a/5/9.c
+++ b/5/9.c
@@ -1,5 +1,3 @@
-#include <stdio.h>
-
 static char daytab[2][13] = {
     {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
     {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
@@ -8,26 +6,10 @@ static char daytab[2][13] = {
 int day_of_year(int year, int month, int day) {
   int i, leap;
 
-  // leap year logic is only valid if this is true.
-  if (year < 1752) {
-    printf("error: invalid year\n");
-    return -1;
-  }
-
-  if (month < 1 || month > 12) {
-    printf("error: invalid month\n");
-    return -1;
-  }
-
-  if (day < 1) {
-    printf("error: invalid day\n");
-    return -1;
-  }
-
   leap = year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
 
   for (i = 1; i < month; i++)
-    day += daytab[leap][i];
+    day += *(*(daytab + leap) + i);
 
   return day;
 }
@@ -36,22 +18,10 @@ int day_of_year(int year, int month, int day) {
 void month_day(int year, int yearday, int *pmonth, int *pday) {
   int i, leap;
 
-  if (year < 0) {
-    *pmonth = *pday = -1;
-    printf("error: invalid year\n");
-    return;
-  }
-
-  if (yearday < 1) {
-    *pmonth = *pday = -1;
-    printf("error: invalid yearday\n");
-    return;
-  }
-
   leap = year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
 
-  for (i = 1; yearday > daytab[leap][i]; i++)
-    yearday -= daytab[leap][i];
+  for (i = 1; yearday > *(*(daytab + leap) + i); i++)
+    yearday -= *(*(daytab + leap) + i);
 
   *pmonth = i;
   *pday = yearday;
-- 
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