Question

/************************************************************************* * Compilation: javac JavaLab1.java * Execution: java JavaLab1 * Authors: Odile wolf, Olusola Samuel-Ojo * Date created: Jan 15th 2014 * Last update date: Sep 13th 2017 * You will modify the code to ask the user for their age and the age of their child, and output how old the mother * was when the child was born * % java JavaLab1 * What is your name ? Jane * Jane, what is your age? 30 * What is your child's age? 10 * you were 20 when your child was born. * NOTE: I have put a lot of comments to guide you in the code. *************************************************************************/ import java.io.*; public class JavaLab1 { public static void main(String[] args) { // first we define our input streams. InputStreamReader input = new InputStreamReader(System.in); BufferedReader reader = new BufferedReader(input); String sName; Integer motherAge; // we catch exceptions if some are thrown. // an exception would be entering a string when a number is expected try { System.out.println("what is your name?"); // we read a string from the stream sName = reader.readLine(); System.out.println(sName+" ,what is your age?"); // parseint will transform a string i.e."123" into a number 123 motherAge = Integer.parseInt(reader.readLine()); // this will print "Jane, you are 30", if the inputs were "Jane" and 30 System.out.println(sName + " ,you are "+ motherAge); } catch (IOException e){ System.out.println("Error reading from user"); } } }

USING THIS JAVA CODE

You will then modify the program to ask for the age of the mother, the age of the child and will deduce the age the mother was when she had the child.

Answer 1

Here I am writing the modified code as per your requirements;

I will highlight the changes made in code with blue color.

import java.io.*;
public class JavaLab1{
   public static void main(String[] args) {
   // first we define our input streams.
   InputStreamReader input = new InputStreamReader(System.in);   
BufferedReader reader = new BufferedReader(input);
   String sName;
   Integer motherAge;
int sonAge;
// we catch exceptions if some are thrown.
// an exception would be entering a string when a number is expected
try
{
System.out.println("what is your name? "); // we read a string from the stream
sName = reader.readLine();
System.out.println(sName+" ,what is your age? ");

   // parseint will transform a string i.e."123" into a number 123
motherAge = Integer.parseInt(reader.readLine());

System.out.println("What is your child's age? ");
sonAge = Integer.parseInt(reader.readLine());

// this will print "Jane, you are 30". if the inputs were "Jane" and 30       
System.out.println(sName + " ,you are "+ motherAge);
System.out.println(sName + " you were "+ (motherAge-sonAge) + " when your child was born.");
}
   catch    (IOException e){
   System.out.println("Error reading from user");
   }
  
}
}

To get the mother's age when she had child. we can subtract the child's age from the mother's age to get our answer.

To execute this code you can copy the code and use the commands you have mentioned and you will get the output.

Note: If you have any doubts you can ask me in the comments section.

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