Why is my code giving wrong output, translating inches into centimetres and vice versa

Question

My code is giving incorrect output while everything seems to be alright.

The purpose of the code is to translate inches into centimetres and vice versa.

For example, with inpput cm then 6, the output is:

inch: 6, centimeter: 15.24

But it should be:

inch: 2.362, centimeter: 6

 
Code:
```py
def intocm():
    ms = input('What is it? (inch-in or centimeter-cm): ')
    am = int(input('How many of it: '))
    intocm = 2.54
    global inch
    global cm

    if ms == 'inch' or 'in':
        cm = am * intocm
        inch = am

    elif ms == 'centimeter' or ms == 'cm':
        cm = am
        inch = cm / intocm

    print(f'inch: {inch}, centimeter: {cm}')


intocm()

Answer 1

You missed an equality test in your if statement, and you should be using float (not int). Like,

def intocm():
    ms=input("What is it? (inch-in or centimeter-cm): ")
    am=float(input("How many of it: "))
    intocm=2.54
    global inch
    global cm
    if ms=="inch" or ms=="in":
        cm=am*intocm
        inch=am
    elif ms=="centimeter" or ms=="cm":
        cm=am
        inch=cm/intocm
    print(f'inch: {inch}, centimeter: {cm}')

Which I ran

What is it? (inch-in or centimeter-cm): cm
How many of it: 2.54
inch: 1.0, centimeter: 2.54

(twice)

What is it? (inch-in or centimeter-cm): in
How many of it: 1
inch: 1.0, centimeter: 2.54

Which seems correct.