如何检查一个数字与另一个数字的接近程度？

def check_closeness(num1, num2):
    difference = abs(num1 - num2)
    return difference

# 示例
num1 = 10
num2 = 12
print(f"The closeness between {num1} and {num2} is {check_closeness(num1, num2)}")

def is_close(num1, num2, threshold=5):
    return abs(num1 - num2) < threshold

# 示例
num1 = 10
num2 = 12
print(f"Are {num1} and {num2} close? {is_close(num1, num2)}")

def relative_error(num1, num2):
    if num2 == 0:
        raise ValueError("Cannot divide by zero")
    return abs((num1 - num2) / num2)

# 示例
num1 = 100
num2 = 102
print(f"The relative error between {num1} and {num2} is {relative_error(num1, num2)}")