Program for Prime

bsiguenza · #1 01-Mar-2009, 21:20

I am doing an assignment of a program that prints out all the prime numbers between two values which the user provides.

AND

we're suppose to start with

num= input ("enter starting number") and do likewise to get the stopping number.

then after outputting all the primes the program is to query the user to see if it is desired to do another run. with ans= raw-input("again (y/n)")

please help

crystalattice · #2 01-Mar-2009, 21:49

So what's the problem? You want someone to do it for you? If so, that won't happen here.

Try writing the program and see how far you get. If you post what you come up with to this forum, you are more likely to get assistance. Most of the members here have no problem helping out others, but you have to give us something to work with.

bsiguenza · #3 01-Mar-2009, 23:34

Python Code:

num = input("enter starting number")
num*=1.0
prime = True
for divisor in range(2,num**0.5+1):
    if num/divisor==int(num/divisor):
        prime=False

def isprime(num):
    num*=1.0
    for divisor in range(2,int(num**0.5)+1):
        if num/divisor==int(num/divisor):
            return False
    return True
for a in range(2,num):
    if isprime(a):
        print a

THIS IS THE CODE THAT I HAVE BUT I DON'T KNOW HOW TO ENTER THE LOOP FOR IT TO BE ONLY BETWEEN TWO NUMBERS.

crystalattice · #4 03-Mar-2009, 18:23

Currently it is printing all numbers from 2 to whatever the input number is. You never call for a second number to be input so it will never ask for the second number.

Basically what you need to do is ask for the starting and ending numbers. You have the function to determine the prime numbers; all you have to do is rewrite your loop to iterate through the isprime() function, making sure that the user-given numbers are used as the range.

I also got 2 DeprecationWarnings about integers being expected but float values being given on lines 4 and 14. You may want to look into those but I don't know if you get the same errors. I'm using Python 2.5.1.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Rate This Thread
Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Equation solver	RazoR	C Programming Language	3	18-May-2008 10:24
Two-Tier data dissemination code installation problem	nidhibansal1984	Computer Software Forum - Linux	6	16-Sep-2007 11:13
BOOKEEPING program, HELP!!	yabud	C Programming Language	10	17-Nov-2006 04:48
Help with a complex program	lordfuoco	C++ Forum	5	24-Jun-2006 07:03

Program for Prime

Re: Program for Prime

Re: Program for Prime

Re: Program for Prime