Example to Python program to check Prime number

Example to Python program to check Prime number

In this tutorial, we will discuss the concept of the Example to  Python program to check the Prime number

In this post, we are going to learn how to check a number is prime or not using for and while loop in Python programming language :

 

Prime number

The number that can be divided by 1 and itself. it is called prime number

for Example 2,3,5,7,11,13….

To understand this example programs, you should have previous knowledge of following Python topics

for loop in Python language

while loop in Python language

If statements in Python language

 

Example Python program

Find prime number using for loop

Program 1

This program allows the user to enter a positive number and then it will check the given number is a prime number or not using for loop in Python language

#Python program to check Prime number
#Takes input from user
num=int(input("Enter a number: "))

if num>1:

    for i in range(2,num):
        if (num % i)==0:
            print(num, " is not prime number")
            break;
    else:
        print(num, " is a prime number")

    #if the input number is lessthan or equal to 1
else:
    print(num, " is not prime number")
    

When the above code is executed, it produces the following results

Case 1

Enter a number: 11
11  is a prime number

 

Case 2

Enter a number: 12
12  is not prime number

 

Case 3

Enter a number: 1
1  is not prime number

 

Case 4

Enter a number: -10
10  is not prime number

 

Find prime number using while loop

Program 2

This program allows the user to enter a positive number and then it will check the given number is a prime number or not using while loop in Python language

#Python program to check Prime number
#Takes input from user
num=int(input("Enter a number"))
count=0
i=2

while(i<=num/2):
        if (num % i)==0:
            count=count+1
            break;
        i=i+1
        
if(count==0 and num!=1):
        
        print(" %d is a prime number"%num)

else:
    print(" %d is not aprime number"%num)

When the above code is executed, it produces the following results

Case 1

Enter a number13
13 is a prime number

 

Case 2

Enter a number15
15 is not a prime number

 

 

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