Question

Write one statement to convert a numeric string s into a number and store the number into double variable i. Question 31 (2 points) Given a String variable address, write a String expression consisting of variable's String value concatenated the string "@google.com". So, if the variable refers to "yuan", the value of the expression would be "yuan@google.com" Question 32 (2 points) The expression "Test" + 1 + 2 evaluates to?

Answer 1

Solution:

1.

For converting numeric string into double number the statement is

double i=Double.parseDouble("-101.90");

double i=Double.parseDouble("102.9");

2.

For second question

String address="yuan"

String expression=address+"@google.com";

3.

For third question the output is Test12 Here "Test"+1+2 is nothing but concatenating or joining the strings

For better understanding see the below code snippet:

import java.util.Scanner;
public class Pattern
{
   public static void main(String args[])
       {
           Scanner input=new Scanner(System.in);
          
           //first question solution
           double negative_num=Double.parseDouble("-101.90"); //converting number to double
           double positive_num=Double.parseDouble("102.9");
           System.out.printf("Converting string '-101.90' into number %.2f\n" ,negative_num);
           System.out.printf("Converting string '102.9' into number %.2f\n" ,positive_num);

           //solution for second question
           System.out.print("Enter address: ");
           String address=input.nextLine(); //taking address from user
           String final_output=address+"@google.com"; //concatenating with string
           System.out.printf("%s\n",final_output);

           //solution for third question
           System.out.println("Test"+1+2); //evaluating the expression
       }
}
Code and Output Screenshots:

import java.util.Scanner; public class Pattern public static void main(String args[]) Scanner input=new Scanner (System.in); //first question solution double negative_num=Double. parseDouble ("-101.90"); //converting number to double double positive num=Double.parseDouble("102.9"); System.out.printf("Converting string '-101.90' into number $.2f\n" , negative_num); System.out.printf("Converting string '102.9' into number 4.2f\n" , positive_num); //solution for second question System.out.print("Enter address: "); String address=input.nextLine(); String final_output=address+Cgoogle.com"; System.out.printf("%s\n", final_output); //taking address from user // concatenating with string // solution for third question System.out.println("Test"+1+2); //evaluating the expression

Converting string '-101.90' into number -101.90 Converting string '102.9' into number 102.90 Enter address: yuan yuan@google.com Test12

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