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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int a = 0;
		int b = 0;
		int answer = 0;
 
		Scanner iscan = new Scanner (System.in);
 
		System.out.println("Enter the first number");
 
		int a = iscan.nextline();
 
		System.out.println("Enter your secnond number");
 
		int b = iscan.nextline();
 
		answer = a + b;
 
		System.out.println("The answer is " + answer);
 
 
 
	}
}

Main.java:21: error: variable a is already defined in method main(String[])
		int a = iscan.nextline();
		    ^
Main.java:21: error: cannot find symbol
		int a = iscan.nextline();
		             ^
  symbol:   method nextline()
  location: variable iscan of type Scanner
Main.java:25: error: variable b is already defined in method main(String[])
		int b = iscan.nextline();
		    ^
Main.java:25: error: cannot find symbol
		int b = iscan.nextline();
		             ^
  symbol:   method nextline()
  location: variable iscan of type Scanner
4 errors

Standard output is empty