Several example codes

Program Overview

This Python program reads multiple pairs of integers from the user.
For each pair, it calculates the product without using the * operator.
The program continues until the user enters two zeros, which signals termination.

Python Code:

def multiply(a, b):
    result = 0
    negative = False

    if b < 0:
        b = -b
        negative = True

    for _ in range(b):
        result += a

    return -result if negative else result

while True:
    x = int(input("Enter the first number: "))
    y = int(input("Enter the second number: "))

    if x == 0 and y == 0:
        print("Program terminated.")
        break

    product = multiply(x, y)
    print("The product is:", product)

Sample Output:

Enter the first number: 4
Enter the second number: 3
The product is: 12

Enter the first number: -2
Enter the second number: 5
The product is: -10

Enter the first number: 0
Enter the second number: 0
Program terminated.

Explanation:

Here’s how the program works:
- The multiply() function uses repeated addition to simulate multiplication
- If the second number is negative, the result is negated
- The loop continues until both inputs are zero
- Results are displayed using the print() function