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Sunday, July 19, 2020

Solution Exercise 67: prim number in Python

Exercise 67 

Write a function in Python which takes as argument an integer n and which returns True if the number n is prime and False if n is not prime without using any predefined function.

Solution

def primNumber(n):
    # take initial value of number of divisors
    numberOfDivisors = 0
    for i in range(1,n+1):
        
        # while i is a divisor of n we increment we increment numberOfDivisors
        if n%i == 0:
            numberOfDivisors = numberOfDivisors + 1
    # the integer n is a prim number only if numberOfDivisors == 2
    if numberOfDivisors == 2:
        return True
    else:
        return False
    
# Testing the function
print(primNumber(7)) # The output is True because 7 is a prim number
print(primNumber(6)) # The output is False because 6 is not a prim number


Younes Derfoufi
my-courses.net

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