Question

ПОНЕДЕЛЬНИК, 2 Дек 2019 Информатика Составить программу для нахождения суммы четных чисел от а до b. (а, b задаются с клавиатуры, а меньше b, каждое из этих чисел целое, положительное не превышает 100).

Answer 1

Program to Find the Sum of Even Numbers from a to b

To write a program that finds the sum of even numbers from a to b, where a and b are inputted from the keyboard, you can follow these steps:

1. Prompt the user to enter the values of a and b. 2. Validate the input to ensure that a is less than b and that both a and b are positive integers not exceeding 100. 3. Initialize a variable `sum` to 0 to store the sum of even numbers. 4. Use a loop to iterate through the numbers from a to b (inclusive). 5. Check if each number is even by using the modulo operator `%` to check if the remainder of dividing the number by 2 is 0. 6. If the number is even, add it to the `sum` variable. 7. After the loop finishes, print the value of `sum` as the result.

Here's an example of how the program could be implemented in Python:

a = int(input("Enter the value of a: "))
b = int(input("Enter the value of b: "))

# Validate input
if a >= b or a <= 0 or b <= 0 or a > 100 or b > 100:
    print("Invalid input. Please make sure a is less than b and both are positive integers not exceeding 100.")
else:
    # Initialize sum
    sum = 0

# Iterate through numbers from a to b
    for num in range(a, b+1):
        # Check if number is even
        if num % 2 == 0:
            sum += num

print("The sum of even numbers from", a, "to", b, "is", sum)

Please note that the program assumes the user will input valid values for a and b, as specified in the question. It also handles the case where there are no even numbers between a and b, in which case the sum will be 0.

I hope this helps! Let me know if you have any further questions.