Solution: A prime number is a number that is only divisible by 1 and itself.
Example: 2, 3, 5, 7, 11 etc are prime numbers
Example:
Apex class:
public class PrimeNumberController {
public static void displayPrimeNumbers(Integer startingNumber,Integer endNumber) {
List<Integer> lstPrimeNumber = new List<Integer>();
for(integer i= startingNumber ; i<=endNumber ; i++) {
if(checkPrimeNumber(i) == true) {
lstPrimeNumber.add(i);
}
}
System.debug('The Prime Numbers are: '+lstPrimeNumber);
}
public static Boolean checkPrimeNumber(integer num) {
Boolean isPrimeNumber = true;
if(num <2) {
isPrimeNumber = false;
} else {
for(integer i = 2; i <num; i++) {
integer m = math.mod(num,i);
if(math.mod(num,i) == 0) {
isPrimeNumber = false;
}
}
}
return isPrimeNumber;
}
}
Run the following from developer console
PrimeNumberController.displayPrimeNumbers(40,50);
Output:
