Code Example – Check for Prime Number Objective C

This is a simple Objective C program written to check whether a number is a Prime number.

//

// main.m

// PrimeNumbers

//

// Created by Ravi Shankar on 10/02/12.

// Copyright (c) 2012 blogmines.com. All rights reserved.

//

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])

{

@autoreleasepool {

  

int number;

BOOL isPrime=YES;

NSLog (@”Enter a number”);

scanf(“%i”,&number);

for (int i=2; i < number –1; i++)

{

if (number % i == 0)

{

isPrime = NO;

break;

}

}

if (isPrime)

{

NSLog (@”%i is a Prime Number”,number);

}

else

{

   NSLog (@”%i is not a Prime Number”, number);

}

  

}

return 0;

}

Output (as displayed in Xcode console window)

2012-02-10 15:53:52.072 PrimeNumbers[1164:707] Enter a number

23

2012-02-10 15:53:58.665 PrimeNumbers[1164:707] 23 is a Prime Number


2012-02-10 15:54:41.469 PrimeNumbers[1176:707] Enter a number

24

2012-02-10 15:54:44.589 PrimeNumbers[1176:707] 24 is not a Prime Number


This program checks whether the number is divisible by any of the n-1 number and if divisible (% operator returns reminder as 0) then the flag is set to false otherwise it is set to true. Then based on the flag value the message is printed to the console window.


In Category: Blogging, Develop, ios

Ravi Shankar

A Software developer and blogger who is always looking to provide technical help to the wider community.

Show 1 Comment
  • jaskirat July 5, 2013, 11:02 am

    (y)

Leave a Comment

Get your free copies of the following tech guides by joining the Digital Answers mailing list.