Thread: Operator % cannot be applied to java.lang.String,int?

i cant help myself...

import java.io.*;
 
public class A
 
{
public static void main (String arum[])throws IOException{
BufferedReader tag=new BufferedReader (new InputStreamReader(System.in));
 
String a;
int b;
 
 
 
System.out.println();
System.out.println();
System.out.println();
 
System.out.println("Enter any number: ");
a=tag.readLine();
 
b=a%2;
 
System.out.println();
System.out.println();
 
 
 
	if(b==1)
                {
		System.out.println("The number you entered is ODD");
		}
 
	else if(b<0)
                {
		System.out.println("The number you entered is NEGATIVE");
		}
        else if(a==0)
		{
		System.out.println("The number you entered is ZERO");
		}
        else if(b==0)
                {
		System.out.println("The number you entered is EVEN");
		}
         else 
                {
                System.out.println("You have entered INVALID VALUES");
                }
	}
}

What are you trying to do with a String and the % operator?

What would the results of "hi there" % 4 be?
It makes no sense.

If the String contains numeric digits: "123" then use an Integer class method to convert it to an int value that will work with the % operator.

hmmm.. i use this?

a=Integer.valueOf(String);

Try it and see what happens:
System.out.println("valueOf123=" + Integer.valueOf("123"));

how can i declare that the value entered is invalid

First you must define what values are invalid.
Then you can write code to detect them.

i must say all characters except from 0-9/numbers should be invalid.

What does your program do if you enter invalid data?