answer:Here's a simple function to calculate the GCD of two integers using the Euclidean algorithm in C: ```c #include <stdio.h> // Function to calculate the GCD of two integers int gcd(int a, int b) { if (b == 0) { return a; } else { return gcd(b, a % b); } } int main() { int num1, num2; printf(Enter two integers: ); scanf(%d %d, &num1, &num2); printf(GCD of %d and %d is %dn, num1, num2, gcd(num1, num2)); return 0; } ``` However, it's generally more efficient to use an iterative solution instead of a recursive one to avoid potential stack overflow issues for large inputs: ```c #include <stdio.h> int gcd(int a, int b) { while (b != 0) { int temp = b; b = a % b; a = temp; } return a; } int main() { int num1, num2; printf(Enter two integers: ); scanf(%d %d, &num1, &num2); printf(GCD of %d and %d is %dn, num1, num2, gcd(num1, num2)); return 0; } ```

answer:Here's the gcd function written as a single line of code using a ternary operator and recursion: ```c int gcd(int a, int b) { return b == 0 ? a : gcd(b, a % b); } ```

answer:Here's a simple implementation of a Date class in Python: ```python from datetime import datetime class Date: def __init__(self, year, month, day): self.year = year self.month = month self.day = day @classmethod def from_string(cls, date_string): year, month, day = map(int, date_string.split('-')) return cls(year, month, day) @classmethod def today(cls): today = datetime.today() return cls(today.year, today.month, today.day) def __str__(self): return f'{self.year}-{self.month:02}-{self.day:02}' def __eq__(self, other): return self.year == other.year and self.month == other.month and self.day == other.day def is_before(self, other): if self.year < other.year: return True elif self.year == other.year: if self.month < other.month: return True elif self.month == other.month: return self.day < other.day return False def is_after(self, other): return not self.is_before(other) and not self == other def days_between(self, other): d1 = datetime(self.year, self.month, self.day) d2 = datetime(other.year, other.month, other.day) return abs((d2 - d1).days) # Example usage date1 = Date(2022, 1, 1) date2 = Date.from_string('2022-01-15') print(date1) # Output: 2022-01-01 print(date2) # Output: 2022-01-15 print(date1.is_before(date2)) # Output: True print(date1.days_between(date2)) # Output: 14 today = Date.today() print(today) # Output: current date ``` This Date class supports the following operations: - Initialization with year, month, and day - Creation from a string in 'YYYY-MM-DD' format - Getting the current date - String representation - Equality check - Checking if a date is before or after another - Calculating the number of days between two dates

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