Bash program to check if the Number is a Prime or not
Last Updated :
05 Sep, 2022
Given a number, the task is to find whether the given number is prime or not using Bash Scripting. Examples:
Input: N = 43
Output: Prime
Input: N = 35
Output: Not Prime
Prime Numbers: A prime number is a whole number greater than 1, which is only divisible by 1 and itself. First few prime numbers are : 2 3 5 7 11 13 17 19 23 …..
Approach: We run a loop from 2 to number/2 and check if there is any factor of the number. If we find any factor then the number is composite otherwise prime. Implementation:
BASH
number=43
i=2
f=0
while test $i - le ` expr $number / 2`
do
if test ` expr $number % $i` - eq 0
then
f=1
fi
i=` expr $i + 1`
done
if test $f - eq 1
then
echo "Not Prime"
else
echo "Prime"
fi
|
Output:
Prime
Time complexity: O(N) for input N because using a while loop
Auxiliary Space: O(1)
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