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Mar 7th, 2008

integer sum

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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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Zelores

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Mar 7th, 2008

Re: integer sum

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.

sneekula

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Nearly a Posting Maven

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Mar 11th, 2008

Re: integer sum

Click to Expand / Collapse Quote 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()

sakthivelvm

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Mar 11th, 2008

Re: integer sum

Here you go:

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:"))] )

rikxik

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Mar 11th, 2008

Re: integer sum

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

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.

woooee

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Mar 12th, 2008

Re: integer sum

Click to Expand / Collapse Quote originally posted by rikxik ...

Here you go:
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 !!

bgeddy

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Mar 12th, 2008

Re: integer sum

Click to Expand / Collapse Quote originally posted by bgeddy ...

Nice bit of Python !!

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

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

rikxik

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Mar 12th, 2008

Re: integer sum

Even simpler:

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: ")])

sneekula

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Mar 12th, 2008

Re: integer sum

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.

Zelores

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Mar 12th, 2008

Re: integer sum

Click to Expand / Collapse Quote 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.

bumsfeld

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