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+====== Leap Year ======
+**Concepts:**\\
+If statement and boolean expressions
+**Text:**\\
+Given a year (an integer number), say if it is a leap year.
+A leap year is a year:
+  * divisible by 4
+  * but not by 100
+  * with the exception of the years divisible by 400, which are leap years
+Examples: 1996, 2000 and 2100 are leap years; instead 2015, 1900 and 2100 are not leap years.
+**Solution:**\\
+<file C leap year.c>
+/*
+Given a year (an integer number), say if it is a leap year.
+A leap year is divisible by 4, but not by 100.
+An exception are the years divisible by 400, which are leap years.
+*/
+#include <stdio.h>
+int main(void){
+  int leap=0;
+  int year;
+  printf("Insert an year: ");
+  scanf("%d", &year);
+  /* First solution: base on a support varible leap */
+  if ( year%4==0 )   /* divisible by 4 */
+    leap=1;
+  if ( year%100==0 ) /* but not by 100 */
+    leap=0;
+  if ( year%400==0 ) /* but year divisible by 400 are leap years */
+    leap=1;
+  if ( leap==1 ){
+    printf("%d is a leap year\n", year);
+  }else{
+    printf("%d is not a leap year\n", year);
+  }
+  /* Second solution: using a boolean expression */
+  if ( (year%4==0 && year%100!=0) || year%400==0 ){
+    printf("%d is a leap year\n", year);
+  }else{
+    printf("%d is not a leap year\n", year);
+  }
+  return 0;
+}
+</file>

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