im a beginner and my teacher gives this question 2 solve which i definetly need help.

Write a JAVA program in which a positive whole number is first read in. A ‘for-loop’ is used to extract the factors of the given number. If there are no factors in the range 2 to (n-1), then that number should be a prime number. A break statement is used to transfer the control out of the for loop, if there is a factor:undecided ?

 

Re: im a beginner and my teacher gives this question 2 solve which i definetly need h

actually i don't know to code it............tats my probs....i just know how 2 begin

Code:

   import java.io.*;
            class Number
            {
            Public static void main (String [] args) throws IOException
                      {
                      System.out.print(“Enter the number:”);
                     InputStreamReader reader = new InputStreamReader(System.in);
                     BufferedReader in =new BufferedReader(reader);
                     String text=in.readLine();

 

Re: im a beginner and my teacher gives this question 2 solve which i definetly need h

thanz 4 the advice ill try 2 write the code as much as i can......................:pleased:

 

Re: im a beginner and my teacher gives this question 2 solve which i definetly need h

maybe this is what you want.Try and tell me.

Code:

import java.io.*;
public class Number1{
    
public static void main (String [] args) throws IOException{
    
    InputStreamReader reader = new InputStreamReader(System.in);
    BufferedReader in =new BufferedReader(reader);
    String text="";
    int number=-1;
    while(number<=0){
        System.out.print("Enter the number:");
        text=in.readLine();
        try{
           number=Integer.parseInt(text);
           if (number<=0) System.out.println("number must be positive and not 0!!!");
        }catch(NumberFormatException e){
           System.out.println("error enter a number!!!");
        }
        
    }
    //now you have a number to check for factors
    if (number==1) 
           System.out.println("1 is prime number");
    else{
        int n=number;
        int i;
        int factors=0;
        for (i=2;i<n;i++){
            while (number%i==0){
                 factors++;
                 number/=i;
                 System.out.println("factor="+i);
            }
            
        }
        if (factors>0) 
             System.out.println("\nnot a prime number");
        else
             System.out.println("\nit is a prime number!!!");
    }    
}
}

 

Re: im a beginner and my teacher gives this question 2 solve which i definetly need h

Hey varsha!! I hope u got the code for this program... Otherwise, get it from me in class!!!

 

Re: im a beginner and my teacher gives this question 2 solve which i definetly need h

hey thankz every1 4 helping me................

 

Re: im a beginner and my teacher gives this question 2 solve which i definetly need h

I think your problem may be more of a failure of logic than a failure of java. If I were you, I would attempt to formulate an algorithm to solve the problem in question then flesh it out in pseudocode then convert it to java syntax.

If the problem is that you don't understand how to actually write the code in java but you understand how to solve the problem, that would be a question that I'm sure your java teacher would be happy to answer.