Common factors program in python

Source Code

# Python Program to find the factors of a number

# This function computes the factor of the argument passed
def print_factors[x]:
   print["The factors of",x,"are:"]
   for i in range[1, x + 1]:
       if x % i == 0:
           print[i]

num = 320

print_factors[num]

Output

The factors of 320 are:
1
2
4
5
8
10
16
20
32
40
64
80
160
320

Note: To find the factors of another number, change the value of num.

In this program, the number whose factor is to be found is stored in num, which is passed to the print_factors[] function. This value is assigned to the variable x in print_factors[].

In the function, we use the for loop to iterate from i equal to x. If x is perfectly divisible by i, it's a factor of x.

In this example, you will learn to find the GCD of two numbers using two different methods: function and loops and, Euclidean algorithm

To understand this example, you should have the knowledge of the following Python programming topics:

• Python Functions
• Python Recursion
• Python Function Arguments

The highest common factor [H.C.F] or greatest common divisor [G.C.D] of two numbers is the largest positive integer that perfectly divides the two given numbers. For example, the H.C.F of 12 and 14 is 2.

Source Code: Using Loops

# Python program to find H.C.F of two numbers

# define a function
def compute_hcf[x, y]:

# choose the smaller number
    if x > y:
        smaller = y
    else:
        smaller = x
    for i in range[1, smaller+1]:
        if[[x % i == 0] and [y % i == 0]]:
            hcf = i 
    return hcf

num1 = 54 
num2 = 24

print["The H.C.F. is", compute_hcf[num1, num2]]

Output

The H.C.F. is 6

Here, two integers stored in variables num1 and num2 are passed to the compute_hcf[] function. The function computes the H.C.F. these two numbers and returns it.

In the function, we first determine the smaller of the two numbers since the H.C.F can only be less than or equal to the smallest number. We then use a for loop to go from 1 to that number.

In each iteration, we check if our number perfectly divides both the input numbers. If so, we store the number as H.C.F. At the completion of the loop, we end up with the largest number that perfectly divides both the numbers.

The above method is easy to understand and implement but not efficient. A much more efficient method to find the H.C.F. is the Euclidean algorithm.

Euclidean algorithm

This algorithm is based on the fact that H.C.F. of two numbers divides their difference as well.

In this algorithm, we divide the greater by smaller and take the remainder. Now, divide the smaller by this remainder. Repeat until the remainder is 0.

For example, if we want to find the H.C.F. of 54 and 24, we divide 54 by 24. The remainder is 6. Now, we divide 24 by 6 and the remainder is 0. Hence, 6 is the required H.C.F.

Source Code: Using the Euclidean Algorithm

# Function to find HCF the Using Euclidian algorithm
def compute_hcf[x, y]:
   while[y]:
       x, y = y, x % y
   return x

hcf = compute_hcf[300, 400]
print["The HCF is", hcf]

Here we loop until y becomes zero. The statement x, y = y, x % y does swapping of values in Python. Click here to learn more about swapping variables in Python.

In each iteration, we place the value of y in x and the remainder [x % y] in y, simultaneously. When y becomes zero, we have H.C.F. in x.

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