Leap year: Difference between revisions

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@@ Line 1,351: / Line 1,351: @@
 <syntaxhighlight lang="c">#include <stdio.h>
-int is_leap_year(int year)
+int is_leap_year(unsigned year)
 {
-    return (!(year % 4) && year % 100 || !(year % 400)) ? 1 : 0;
+    return !(year & (year % 100 ? 3 : 15));
 }
-int main()
+int main(void)
 {
-    int test_case[] = {1900, 1994, 1996, 1997, 2000}, key, end, year;
+    const unsigned test_case[] = {
+, 1994, 1996, 1997, 2000, 2024, 2025, 2026, 2100
-    for (key = 0, end = sizeof(test_case)/sizeof(test_case[0]); key < end; ++key) {
+    };
-        year = test_case[key];
+    const unsigned n = sizeof test_case / sizeof test_case[0];
-        printf("%d is %sa leap year.\n", year, (is_leap_year(year) == 1 ? "" : "not "));
+    for (unsigned i = 0; i != n; ++i) {
+        unsigned year = test_case[i];
+        printf("%u is %sa leap year.\n", year, is_leap_year(year) ? "" : "not ");
     }
+    return 0;
 }</syntaxhighlight>
 {{out}}
@@ Line 1,371: / Line 1,376: @@
 is not a leap year.
 is a leap year.
+is a leap year.
+is not a leap year.
+is not a leap year.
+is not a leap year.
 </pre>