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POPython and Prime Numbers
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copied!<p>I know there are a bunch of topics on this, and I hate to create a new one, but none of the topics seem to fit exactly right, unless it is doing something in a more advanced way. I am in an intro to programming class, and want (need?) to use simple commands that we've learned in the first week to do this, and I also want to have code that is "my own" and not just snag something off the internet.</p> <p>I am working on two scripts (.py files) that are extremely basic. One asks for a number and prints out whether it is a prime number or not, the other prints out all of the prime numbers up to the 1000th prime number (Which we know is 7919, because we were given a link to a list of primes to check our work).</p> <p>My first script:</p> <pre><code>yourNumber= input('Enter a number: ') isPrime = 0 if yourNumber == 1: isPrime = 1 print(yourNumber,'is not a prime number') else : for primeCheck in range (int(2), int(yourNumber)): if int(yourNumber)%int(primeCheck) == 0: isPrime = 1 break else: isPrime = 0 if isPrime == 0: print(yourNumber,'is a prime number') else: print(yourNumber,'is not a prime number') </code></pre> <p>This one seems to work for any number except 0 and 1. I don't know what I am doing wrong.</p> <hr> <p>My second script:</p> <pre><code>numberPrimes = 0 startNumber = 0 currentNumber = startNumber isPrime = 0 while numberPrimes < 1000: if currentNumber == 1: currentNumber = currentNumber + 1 else: for primeCheck in range (int(2), int(currentNumber)): if int(currentNumber)%primeCheck == 0: isPrime = 1 break else: isPrime = 0 if isPrime == 0: print(currentNumber, 'is prime') numberPrimes = numberPrimes + 1 currentNumber == currentNumber + 1 else: currentNumber == currentNumber + 1 </code></pre> <p>This one basically spits out "0 is prime" one thousand times. Somehow the currentNumber is not going up or something. I'm not sure.</p>

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