} Java program to find all Prime Numbers from array We just need to make some minor modifications like the initialization of “i” happens just before the start of the loop, incrementation of “i” happens inside the loop and of course, we need to change for loop into while loop.
A big list of prime numbers up to 100 code#
We can also use the while loop instead of for loop, let’s re-write the above code using while loop. Prime Number Program in Java using While Loop
If the number is greater than 1 and it is not divisible any number within the range of 2 to number/2 then it returns true. Returns false when the remainder is zero. Returns false when the number is less than or equal to 1. It returns boolean values based on the below criteria The checkPrime() method, checks whether the number passed is prime or not. Using Scanner get the input from the user and store it in the variable “number”. Scanner scanner = new Scanner(System.in) In an iterative loop, divide the number between the range 2 to number/2, and check if the remainder is not zero, if zero then the number is not a prime. Check whether the number is greater than 1, if the number is less than 1 then it cannot be a prime. It cannot be divided by any number greater than 19, 20 cannot divide 19 and range to consider is 19/2 which is 9.5 and hence we can consider the range between 2 to 9. Furthermore, we can limit the range by considering the fact that no number can have factors greater than the square root of the number (or) number by half (including the number itself).įor Example, Let’s take the number 19. In general, a number cannot be divided by any number which is greater than itself and hence we can set the upper limit as to the number. We all know that the prime numbers can only be divided by itself and 1. 
1 is not considered as a Prime because it does not meet the criteria which is exactly two factors 1 and itself, whereas 1 has only one factor Prime Number Program in Java using Scanner
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