Hello I have created this program to check if a number is a prime number. It works but for some reason says that 999 is a prime number. Where is my mistake. It would be great if someone explained. Thank You!
Here is my program:
number = raw_input('Enter a Number: ')
nnumber = int(number)
prime_range = range(2, nnumber)
for x in prime_range:
if nnumber % x == 0:
print 'Not a Prime Number!'
print 'Prime Number!'
x starts with
2, then tests
999 % 2; it is
else is executed, "Prime number!" is printed, and loop is broken out of. Program ends.
Instead, you need to print "Prime number!" only when you tested all possibilities for
x. The easiest way to do that is to unindent
else: (and delete
for x in prime_range: if nnumber % x == 0: print 'Not a Prime Number!' break else: print 'Prime Number!'
else of a
for completes withoout being broken: exactly what you want.