Little help part 3

fonz87 · #1 05-Mar-2008, 22:47

Just wondering anyone here can help me getting started or show me where i can read how to write this program

i have to write a program where if i put 5 it should output 55

for example, when u put 5 it will compute 1^2+2^2+3^2+4^2+5^2 and the output is 55

i got a code where its adding up all the 1 2 3 4 5 and im getting a 15
and i also got a code where it's a factorial and when i put 5 it's times all the numbers and outputs a number but i aint getting 55

crystalattice · #2 06-Mar-2008, 21:02

Why don't you post your code so we can see how you're approaching the problem? I have an idea of what to do but I want to make sure it's not the same thing you've already tried.

fonz87 · #3 07-Mar-2008, 22:13

Python Code:

def main():
    x=input("Enter a number")
    sum=0
    for i in range(1,x+1):
        sum+=i
    print sum
main()

OK here is the code where it adds up the numbers ... but it doesn't add and times the numbers by the cude. like it does this 1 + 2 + 3+ 4+5 .. it gives me 15 but it doesn't do 1^2+2^2+3^2+4^2+5^2 = 55 .. i wrote a code but i guess i didn't save it and now I'm pissed off

it's gotta be written in parameters...

so i was trying this

Python Code:

def times(y):
    sum=0
    for i in range(1,y+1):
        sum+=i


def main():
    x=input("Enter a number")
    w=times(x)

    print w

main()

but it doesn't work, not sure why it's doing that but it pissing me off

fonz87 · #4 07-Mar-2008, 22:16

Also if you know how to print list backwards without sorting the list .. that would be awesome.. this is what i have so far done where i got the list to print backwards but its sorting them out.. we did sort in class and i try to use the same code but it doesn't work. its sorts them but it doesn't print the way i want them to do. like for example if i put in 1 2 3 9 5 0 5 it should print 5 0 5 9 3 2 1 but instead its print 9 5 5 3 2 1 0

here is the code

Python Code:

import string
import math

def reverse(L):
    m=len(L)
    for i in range(m+2):
        for j in range(m-1):
            if L[j]<L[j+1]:
                L[j],L[j+1]=L[j+1],L[j]
                
    


def main():
    x=raw_input("Enter numbers to reverse it")
    mylist=[]
    sentinel="*"
    while (x!=sentinel):
        y=eval(x)
        mylist.append(y)
        x=raw_input("Enter numbers to reverse it")
        
    reverse(mylist)

    print mylist

main()

crystalattice · #5 12-Mar-2008, 20:59

Your first problem doesn't appear to have you squaring the values at any point. Isn't that a requirement? All you're doing is adding the numbers together in the range. You have to have a step where each number is squared before it is added to the sum.

For your second problem, Python has a method for reversing lists. Check out the tutorial:http://docs.python.org/tut/node7.html. You don't have to create your own method to do it, unlike C/C++, which is one of the benefits of Python.

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Little help part 3

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