Hello people, welcome back to Programming In Python! Here I will discuss a Python program that finds whether a given number is a prime number or composite number or neither of them.
Definition: A number greater than 1 is said to be prime if it has no other factors other than 1 and itself. The numbers 0 and 1 are neither prime nor composite. And all remaining numbers are composite numbers.
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Prime or Composite – Code Visualization
Task :
To find whether a number is a prime or composite number.
Approach :
- Read the input number using
input()orraw_input(). - Check if num is greater than 1.
- Find factors
- Run a for loop ranging from 2 to the number entered.
- Check if num is divided by any number that gives a remainder of 0.
- If it gives a remainder of 0, the number is not a prime number.
- If not, the number is a prime number.
- If the number entered is either 0 or 1, we say that the number is neither a prime nor a composite number.
- All other numbers are composite numbers.
- Print the result.
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Program :
num = int(input("Enter any number : "))
if num > 1:
for i in range(2, num):
if (num % i) == 0:
print(num, "is NOT a prime number")
break
else:
print(num, "is a PRIME number")
elif num == 0 or 1:
print(num, "is a neither prime NOR composite number")
else:
print(num, "is NOT a prime number it is a COMPOSITE number")
Output :
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