Program #11 (U2): Leap Year Checker
Task: Read a year and apply the rules: divisible by 400 → leap, divisible by 100 → not leap, divisible by 4 → leap, else not. Print the correct verdict.
/* Program: Leap Year Checker (U2) Logic: divisible by 400 → leap; else if divisible by 100 → not leap; else if divisible by 4 → leap; else not leap.*/
#include <stdio.h>
int main(void) {
int year;
printf("Enter year: ");
if (scanf("%d", &year) != 1) {
printf("Invalid input. Please enter an integer.
");
return 0;
} if (year < 0) {
printf("Year must be non-negative.
");
return 0;
} /* Apply leap year rules */
if (year % 400 == 0) {
printf("%d is a leap year.
", year);
} else if (year % 100 == 0) {
printf("%d is not a leap year.
", year);
} else if (year % 4 == 0) {
printf("%d is a leap year.
", year);
} else {
printf("%d is not a leap year.
", year);
} /* Examples:
2000 -> leap 1900 -> not leap 2024 -> leap 2023 -> not leap*/
return 0;
}