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#1
April 10th, 2013, 05:08 AM
 mrhlth
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Join Date: Mar 2013
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Sumoftwonumbers

Hi guys,
for the question:
Define a function named sum. This function expects two numbers, named low and high, as arguments. The function computes and returns the sum of all of the numbers between low and high, inclusive.

ive done:
def sum(num1, num2):

sumoftwo = 0
index = 0

for num1 < num2:
sumoftwo = sumoftwo + (num1 + index)
index = index + 1

return sumoftwo

i think thats correct, if theres any errors please point it out. also when i tried to run it, it gives me an error of "invalid syntax" while highlighting the "<", not sure what the problem is. Still a noob at python, and any help is appreciated! thanks

#2
April 10th, 2013, 05:38 AM
 partoj
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Join Date: Feb 2013
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Quote:
 Originally Posted by mrhlth Use code tags to make your code readable in the forum. Code: ```def sum(num1, num2): sumoftwo = 0 index = 0 for num1 < num2: sumoftwo = sumoftwo + (num1 + index) index = index + 1 return sumoftwo```

The syntax "for num1 < num2" is not correct, you need to use range():

Code:
`for i in range(num1, num2+1):   # +1 makes it inclusive`

#3
April 10th, 2013, 11:06 AM
 b49P23TIvg
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Join Date: Aug 2011
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Most embarrassing! Your program is not correct.
Quote:
 Originally Posted by mrhlth i think thats correct,...when i tried to run it, it gives me an error of "invalid syntax"

Test data for you:
Code:
```lo hi sum_of_inclusive_integers
1 5 15
2 5 14
3 5 12
4 5  9```

The handy formula:
(low + high)*(1+high-low)/2
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[code]Code tags[/code] are essential for python code!

#4
April 17th, 2013, 02:39 AM
 mrhlth
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Join Date: Mar 2013
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Quote:
 Originally Posted by partoj The syntax "for num1 < num2" is not correct, you need to use range(): Code: `for i in range(num1, num2+1): # +1 makes it inclusive`

Quote:
 Originally Posted by b49P23TIvg Most embarrassing! Your program is not correct. Test data for you: Code: ```lo hi sum_of_inclusive_integers 1 5 15 2 5 14 3 5 12 4 5 9``` The handy formula: (low + high)*(1+high-low)/2

Sorry for the late reply! and thank you both very much.

#5
April 18th, 2013, 01:26 PM
 Dietrich
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Join Date: Feb 2005
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Though shall not use function names that collide with Python's built-in function names.
Comments on this post
Matt1776 agrees!
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