Question

python help: how do i prevent an infinite loop?

Answer 1

```
print('1. Argentine Peso')
print('2. Brazilian Real')
print('3. British Pound')
print('4. European Euro')
print('5. Indian Rupee')
print('6. Japanese Yen')
print('7. Russian Ruble')
print('8. Other \n')

usd = 0
usd = eval(input('Enter amount to convert (=< 0 to exit): '))

peso = usd * 8.48
real = usd * 2.46
pound = usd * 0.62
euro = usd * 0.79
rupee = usd * 61.59
yen = usd * 109.49
ruble = usd * 39.45

num = 0
num = eval(input('Enter Selection: '))
while num > 0:
if num == 1:
print('' + str(usd) + ' US Dollars converts to: ' + str(round(peso,2)) + ' Argentine Pesos.')
elif num == 2:
print('' + str(usd) + ' US Dollars converts to: ' + str(round(real,2)) + ' Brazilian Real.')
elif num == 3:
print('' + str(usd) + ' US Dollars converts to: ' + str(round(pound,2)) + ' British Pound.')
elif num == 4:
print('' + str(usd) + ' US Dollars converts to: ' + str(round(euro,2)) + ' European Euro.')
elif num == 5:
print('' + str(usd) + ' US Dollars converts to: ' + str(round(rupee,2)) + ' Indian Rupee.')
elif num == 6:
print('' + str(usd) + ' US Dollars converts to: ' + str(round(yen,2)) + ' Japanese Yen.')
elif num == 7:
print('' + str(usd) + ' US Dollars converts to: ' + str(ruble) + ' Russian Ruble.')
elif num == 8:
currency = input('Enter current to convert to: ')
amount = eval(input('Enter the conversion factor for ' + currency + ': '))
random = usd * amount
print('' + str(usd) + ' US Dollars converts to: ' + str(random) + ' ' + currency + '.')


```

Answer 2

this is my code

Answer 3

its my first assignment using a while loop

Answer 4

if you want, you can debug the code by stepping through it but the basic idea you're not getting is the logic of a while loop.
```
while(condition){
//code
//update
}
```

in your code num never gets modified so it's always > 0 no matter what

Answer 5

tbh I can't even tell why you're using a while loop there

Answer 6

hm so in each if statement i need to add something like
num = num + 1
?

we have to use a while loop because it needs to restart again after it completes one conversion.

Answer 7

num++; should offer the same functionality. that's a weird program tho

Answer 8

yeah its kinda strange, idk just doing my assignments lol
ill have to use num = num + 1 i think cause python doesnt have that ability to use num++

Answer 9

sorry I'm tired as he*k

Answer 10

oh no not a problem, i understand

Answer 11

feel free to get off haha, i will figure it out eventually

Answer 12

count += 1; should work

Answer 13

lol no way, I have my own assignments to do. but the internet is more interesting :/

Answer 14

hahahah i hear that

Answer 15

so basically if you enter 1 it goes through the menu from 1-8?

Answer 16

but if you enter 6 it only does 6-8?

Answer 17

ok ill explain

Answer 18

you enter say '50' for usd
then select one number from 1-8 and it only does the one selected. then it should ask you to enter a value for usd again

Answer 19

right now it does what you said, if you enter 5 it runs 6,7,8 but i need it to only run the selected option

Answer 20

You can use the break function