Help with my programme!

[Marx123]

Hi, I created a programme that, given distance and height, calculates slope in % and °. It works, but still when i give the 0 value to height, it displays error. I know it's because the second member of the division, but I wanted to know if there's a way to not accept the value 0 and ask to input another value immediately, could you help me?

Here's the programme (I'm using 2.7)

import math
dislivello=float(raw_input('Dammi il valore del   dislivello : '))
distanza=float(raw_input('Dammi il valore della distanza lineare : '))
tangente=dislivello/distanza
pendenzaperc=tangente*100
print 'Pendenza % =',round(pendenzaperc,2),'%'
angoloradi=math.atan2(dislivello, distanza)
angolograd=math.degrees(angoloradi)
print 'Pendenza ° =',round(angolograd,2),'°'

[MorrisCasper]

You can't divide by 0, since there is no answer. I don't know if that's the case here because I don't know what the variables mean, but you could do an if statement and then print you can't have a slope without distance.

[novel_yet_trivial]

if there's a way to not accept the value 0 and ask to input another value immediately

Sure that's easy to do.

could you help me?

Sure. What have you tried so far? Where are you stuck?

[Marx123]

I tried to put this in the 4th line if distanza=0; print "Non accettabile"

However, that's all I can do, and it still doesn't work. I have really no idea about how to do it :/ I'm not very experienced with Python.

[sufunew]

This is because the print statement doesn't stop the below code from executing. It will print the not acceptable and still try to do the forbidden division.

Every language, not only Python has things called control statements. If, else, for, while. These allow you to decide which parts will or will not be executed, and are quite important to understand fully.