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Using Loops to track user input

P: n/a
I don't understand how to use a loop to keep track of user input. Could
someone show me how to do what the program below does with a loop?

Thnaks!

----------------------------
#Write a program that reads 10 numbers from the user and prints out the
sum of those numbers.

num0 = input("Enter a number: ")
num1 = input("Enter a number: ")
num2 = input("Enter a number: ")
num3 = input("Enter a number: ")
num4 = input("Enter a number: ")
num5 = input("Enter a number: ")
num6 = input("Enter a number: ")
num7 = input("Enter a number: ")
num8 = input("Enter a number: ")
num9 = input("Enter a number: ")

num = num0+num1+num2+num3+num4+num5+num6+num7+num8+num9

print num
----------------------------------

Jul 18 '05 #1
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8 Replies


P: n/a
| Write a program that reads 10 numbers from the user
| and prints out the sum of those numbers.

hokiegal ...

Here is one way ...

nLoops = 10
total = 0

for i in range( nLoops ) :

num_in = int( raw_input( 'Enter an Integer : ' ) )

total += num_in

print total

--
Cousin Stanley
Human Being
Phoenix, Arizona
Jul 18 '05 #2

P: n/a
hokiegal ...

Another way if you also wish to save the input numbers ...

nLoops = 10

list_nums = []

for i in range( nLoops ) :

this_num = int( raw_input( 'Enter an Integer : ' ) )

list_nums.append( this_num )

total = reduce( int.__add__ , list_nums )

print
print list_nums
print
print total

--
Cousin Stanley
Human Being
Phoenix, Arizona
Jul 18 '05 #3

P: n/a
hokiegal99 wrote:
I don't understand how to use a loop to keep track of user input. Could
someone show me how to do what the program below does with a loop?

Thnaks!

----------------------------
#Write a program that reads 10 numbers from the user and prints out the
sum of those numbers.

num0 = input("Enter a number: ")
num1 = input("Enter a number: ")
num2 = input("Enter a number: ")
num3 = input("Enter a number: ")
num4 = input("Enter a number: ")
num5 = input("Enter a number: ")
num6 = input("Enter a number: ")
num7 = input("Enter a number: ")
num8 = input("Enter a number: ")
num9 = input("Enter a number: ")

num = num0+num1+num2+num3+num4+num5+num6+num7+num8+num9

print num
----------------------------------


# If you are want to loop a fixed amount of time, as I understand a way
# would be:
sum = 0
for i in xrange(10):
sum += input("Enter a number: ")
average = sum/10
print average

# I guess however it would be more pythonic, because you do not really
# need that counter, to do something like:
entries=0
sum=0
while entries < 10:
try:
sum += input("%d) Enter a number: " % (entries + 1) )
entries += 1
except:
print "You need to enter 10 values."
print "The average is %d" % (sum)

# And when you need you would want to make a "general" tool out of your
# case...
entries=0
sum=0
try:
while 1:
sum += input("%d) Enter a number: " % (entries + 1) )
entries += 1
except:
if entries == 0:
print "You did not enter any number. Can not make average of
nothing."
else:
print "The average of all %d numbers entered is %d" % (entries,
sum/entries)

Jul 18 '05 #4

P: n/a
You guys are great! Thanks for all the examples.

Cousin Stanley wrote:
hokiegal ...

Another way if you also wish to save the input numbers ...

nLoops = 10

list_nums = []

for i in range( nLoops ) :

this_num = int( raw_input( 'Enter an Integer : ' ) )

list_nums.append( this_num )

total = reduce( int.__add__ , list_nums )

print
print list_nums
print
print total


Jul 18 '05 #5

P: n/a
Behrang Dadsetan wrote:
hokiegal99 wrote:
I don't understand how to use a loop to keep track of user input.
Could someone show me how to do what the program below does with a loop?


# If you are want to loop a fixed amount of time, as I understand a way
# would be:
sum = 0
for i in xrange(10):
sum += input("Enter a number: ")
average = sum/10
print average


Ok, I just looked up the Reference documentation and
int(raw_input("prompt text")) would be probably better than my suggested
input() - like in the other anwsers you received.
One should maybe note that if the end average calculated should be a
float, then you need to use

sum = 0.0

and should the user entering the data be allowed to use float values you
will probably want to use

float(raw_input("prompt text"))

Regards, Ben.

Jul 18 '05 #6

P: n/a
Hi hokiegal99 if that's what you want me to call you,

hokiegal99 wrote:
I don't understand how to use a loop to keep track of user input. Could
someone show me how to do what the program below does with a loop?
Your text book or tutorial should show that quite well, but here we go:

Thnaks!

----------------------------
#Write a program that reads 10 numbers from the user and prints out the
sum of those numbers.

num0 = input("Enter a number: ")
num1 = input("Enter a number: ")
num2 = input("Enter a number: ")
num3 = input("Enter a number: ")
num4 = input("Enter a number: ")
num5 = input("Enter a number: ")
num6 = input("Enter a number: ")
num7 = input("Enter a number: ")
num8 = input("Enter a number: ")
num9 = input("Enter a number: ")

num = num0+num1+num2+num3+num4+num5+num6+num7+num8+num9

print num
----------------------------------


#v+
sum = 0.0
for i in range(10):
sum += int(raw_input("Enter a number: "))
print sum
#v-

If your prof is any good, (s)he reads this newsgroup as well ;-)

-- Gerhard

Jul 18 '05 #7

P: n/a
Perl's motto is "there's more than one way to do it," right? Well, after
reading all of these responses, I think Python could make the same
claim. Thanks again guys!
Bob Gailer wrote:
Not to neglect the 1-liner:

import operator; reduce(operator.add,[int(raw_input("Number>")) for i in
range(10)])

Bob Gailer
bg*****@alum.rpi.edu
303 442 2625


Jul 18 '05 #8

P: n/a
Gerhard Häring wrote:

hokiegal99 wrote:
I don't understand how to use a loop to keep track of user input. Could
someone show me how to do what the program below does with a loop?
Your text book or tutorial should show that quite well, but here we go:

[snip] If your prof is any good, (s)he reads this newsgroup as well ;-)


You missed this one Gerhard. In another thread, hokiegal99 already
told us "I am a funeral director trying to write a small program that
calculates the number of years, months and days a person has lived by
entering the year, month and day of their birth. ..."

Not homework this time. :-)

-Peter
Jul 18 '05 #9

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