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Join Date: Mar 2008

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Zelores

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integer sum

Mar 7th, 2008

Hi, I just joined today and i need some help with python. I just started using python not to long ago in my intro programming class. We have an assignment coming up and i need some help. How do you get the sum of an integer. ie: you put in 123 and the sum is 6. I cant seem to figure it out. how do i go about doing that?

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Join Date: Oct 2006

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sneekula

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Re: integer sum

Mar 7th, 2008

You need to convert your integer into a string, iterate the string and sum up the string's numeric characters as integers.

If n is your integer, then str(n) is the string.
If c is the string's numeric character, then int(c) is its numeric/integer value.
Use a for loop to iterate the string.

No one died when Clinton lied.

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sakthivelvm sakthivelvm is offline

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Re: integer sum

Mar 11th, 2008

•

Originally Posted by Zelores

Hi, I just joined today and i need some help with python. I just started using python not to long ago in my intro programming class. We have an assignment coming up and i need some help. How do you get the sum of an integer. ie: you put in 123 and the sum is 6. I cant seem to figure it out. how do i go about doing that?

def main():
n=int(raw_input("enter the number"))
reminder=n%10
quotient=n/10
sum=reminder

while(quotient>=10):
reminder=quotient%10
quotient=quotient/10
sum=sum+reminder
if(quotient<10):
sum=sum+quotient
print 'the given number',n
print "the sum of integer is",sum

if __name__ == '__main__':
main()

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Join Date: Mar 2008

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rikxik

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Re: integer sum

Mar 11th, 2008

Here you go:

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
print reduce( lambda x,y: x+y, [int(i) for i in list(raw_input("Enter integer:"))] )
print reduce( lambda x,y: x+y, [int(i) for i in list(raw_input("Enter integer:"))] )

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Join Date: Dec 2006

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woooee

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Re: integer sum

Mar 11th, 2008

Without the lambda (which you probably haven't covered)

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
input_str=raw_input("Enter a string of digits ")
 
##-------------- Simple way --------------------------------------------------
input_list = [int(x) for x in input_str]
print sum(input_list), input_list
 
##-------------- Check that it is a digit and sum manually -------------------
input_list=[]
errors=0
for chr in input_str:
   if chr.isdigit():
      input_list.append(int(chr))
   else:
      print "Only the numbers 0 through 9 are allowed"
      errors=1
if not errors:
   total=0
   for x in input_list:
      total += x
   print "total =", total, input_list
input_str=raw_input("Enter a string of digits ")

##-------------- Simple way --------------------------------------------------
input_list = [int(x) for x in input_str]
print sum(input_list), input_list

##-------------- Check that it is a digit and sum manually -------------------
input_list=[]
errors=0
for chr in input_str:
   if chr.isdigit():
      input_list.append(int(chr))
   else:
      print "Only the numbers 0 through 9 are allowed"
      errors=1
if not errors:
   total=0
   for x in input_list:
      total += x
   print "total =", total, input_list

Last edited by woooee; Mar 11th, 2008 at 4:07 pm.

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bgeddy

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Re: integer sum

Mar 12th, 2008

•

Originally Posted by rikxik

Here you go:
Help with Code Tags

Python Syntax (Toggle Plain Text)
print reduce( lambda x,y: x+y, [int(i) for i in list(raw_input("Enter integer:"))] )
print reduce( lambda x,y: x+y, [int(i) for i in list(raw_input("Enter integer:"))] )

Nice bit of Python !!

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rikxik

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Re: integer sum

Mar 12th, 2008

•

Originally Posted by bgeddy

Nice bit of Python !!

Thanks. Actually, I realized that it should have been much more simpler:

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
sum([int(i) for i in list(raw_input("Enter integer:"))])
sum([int(i) for i in list(raw_input("Enter integer:"))])

Sometimes the obvious isn't obvious to me

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Join Date: Oct 2006

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sneekula

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Re: integer sum

Mar 12th, 2008

Even simpler:

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
sum([int(i) for i in raw_input("Enter integer: ")])
sum([int(i) for i in raw_input("Enter integer: ")])

No one died when Clinton lied.

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Join Date: Mar 2008

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Zelores

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Re: integer sum

Mar 12th, 2008

thanks for all the help everyone! it really helped me. im still a noob when it comes to programming, espically to python. its just to bad that after this quarter i wont be working with python anymore. its all java and c++ lol.

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bumsfeld

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Re: integer sum

#10

Mar 12th, 2008

•

Originally Posted by Zelores

thanks for all the help everyone! it really helped me. im still a noob when it comes to programming, espically to python. its just to bad that after this quarter i wont be working with python anymore. its all java and c++ lol.

Hehe, every computer student has to go through the pain of C++ or Java programming, so you learn to be humble in the eyes of your trainer. In science, it is more important to solve the problems quickly, so Python rules.

Should you find Irony, you can keep her!