Find mistake in this coding

Question

import java.util.Scanner;
public class Program
{
public static void main(String[] args) {
Scanner cal : new Scanner (System.in);
System.out.println("Enter First Value for addition :-")
double a : cal.nextDouble( );
System.out.println("Enter Second Value for addition :-")
double b : cal.nextDouble( );
double c : a+b;
System.out.println("Your Answer is "+c)
}
}

Answer 1

Replace the colon in the Object, and Variable declaration with the equals sign and add the semicolon after each print statement

Answer 2

You must add semicolon (";") at the end of each line, you did it somewhere but not everywhere...
also: you need to replace colon with equal sign when you assign the resul of nextDouble function to the variables "a","b" and "c"

that's the correct one:

import java.util.Scanner;
public class Program
{
public static void main(String[] args) {
Scanner cal = new Scanner (System.in);
System.out.println("Enter First Value for addition :-");
double a = cal.nextDouble( );
System.out.println("Enter Second Value for addition :-");
double b = cal.nextDouble( );
double c = a+b;
System.out.println("Your Answer is "+c);
}
}

Answer 3

import java.util.Scanner;
public class Program
{
public static void main(String[] args) {
Scanner cal : new Scanner (System.in);
System.out.println("Enter First Value for addition :-");
double a : cal.nextDouble( );
System.out.println("Enter Second Value for addition :-");
double b : cal.nextDouble( );
double c : a+b;
System.out.println("Your Answer is "+c);
}
}
now it's output is " No Output "

Answer 4

It will be so. You are using double so you need to input two float numbers and add next value under first value in input.
examples
2.4
2.5
Output: 4.9

import java.util.Scanner;
public class Program
{
public static void main(String[] args) {
Scanner cal = new Scanner (System.in);
System.out.println("Enter First Value for addition :-");
double a = cal.nextDouble();
System.out.println("Enter Second Value for addition :-");
double b = cal.nextDouble();
double c = a+b;
System.out.println("Your Answer is "+c);
}
}