Home Dart Prime Number program in dart

Prime Number program in dart

0
CHECK PRIME NUMBER Dart Program
CHECK PRIME NUMBER Dart Program

Hi Guys, Welcome to Proto Coders Point, In this dart tutorial we will learn, What is a prime number, check if a given number in prime or not & a dart program to print prime number from 1 to N.

What is a Prime Number?

A Prime Number in math are the numbers that are greater then 1 & are divisible by 1 or itself.

In other Words, A number that can’t be divided by any other number, rather then 1 or itself.

Prime Number Examples

Eg:

5 => 5 can’t be divided by any other numbers.
3 => 3 can’t be divided by any other numbers.
7 => 7 can’t be divided by any other numbers.
13 => 13 can’t be divided by any other numbers.

Not a Prime Number Examples

Eg:

4 => 4 is divisible by 2 so it not a prime number.
6 => 6 is divisible by 2 so it not a prime number.
8 => 8 is divisible by 2 so it not a prime number.
10 => 10 is divisible by 2 so it not a prime number.

If you observe you can see that, all the even number are not a prime number, except 2.

NOTE: 0 and 1 are always said to be not a prime number.

How to check if a number is prime or not in dart

Let’s write dart programs to check if a number is prime or no.

1. Dart Program to check a number prime or no

In this dart program, we will initialize a Integer with a number value & then check if that number is prime or no.

void main(){
  int i,m=0,flag=0;
  int num = 5;

  m=num~/2;

  for(i = 2;i<=m;i++){
    if(num%i == 0){
      print('$num is not a prime number');
      flag=1;
      break;
    }
  }

  if(flag==0){
    print('$num is prime number');
  }
}

2. check prime number using method in dart program

void main(){
     // call method by passing a integer value to it
     checkPrime(5);
     checkPrime(8);
     checkPrime(13);
     checkPrime(76);
     checkPrime(7);
}

// a method that checks prime or not prime
void checkPrime(int num){
   int i,m=0,flag=0;
 
  m=num~/2;


  for(i = 2;i<=m;i++){
    if(num%i == 0){
      print('$num is not a prime number');
      flag=1;
      break;
    }
  }

  if(flag==0){
    print('$num is prime number');
  }
}

3. Prime number dart program – take input from user

So now in below code, the number to be checked is not predefined, Here the dart code will ask the user to enter a number to be checked whether it a prime or not

import 'dart:io';
import 'dart:math';
void main(){
  

   print('Enter number to check prime or no');

   int? num = int.parse(stdin.readLineSync()!); 

  print('$num');

  if(CheckPrime(num)){
           print('$num is a prime');
  }else{
    print('$num is not a prime');
  }

}

bool CheckPrime(int num){

  if(num<=1){
     return false;
  }
  
  for (int i = 2;i<=sqrt(num);i++){
    if(num%i == 0){
      return false;
    }
  }
  return true;

}
prime number program in dart

4. Dart program to print prime number from 1 to N

Now let’s write a dart program to print all the prime numbers from 1 to N.

import 'dart:io';
import 'dart:math';

void main(){
      print('Enter Nth');
      int? N = int.parse(stdin.readLineSync()!);
      print('----------------------------');
      for(int i=2;i<= N;i++){
        checkPrime(i);
      }
}

void checkPrime(int num){
   int i,m=0,flag=0;
   m=num~/2;
  for(i = 2;i<=m;i++){
    if(num%i == 0){
      flag=1;
      break;
    }
  }

  if(flag==0){
    print('$num');
  }
}


Similar dart programs to learn dart language

Generate Random number in dart

palindrome program in dart

ArmStrong number program in dart

Fibonacci sequence in dart

pattern program in dart

string to ascii

prime number program in dart

No Comments