Question

in java

3) Sum. Write a program that prompts the user to read two integers and displays their sum. Your program should prompt the user to read the number again if the input is incorrect.

Answer 1

Program

import java.util.Scanner; //importing Scanner class
public class Main
{
   public static void main(String[] args) {
   Scanner sc=new Scanner(System.in);
   String num1="",num2=""; //declaring two number variables as string
   int sum; //variable to store sum of numbers
   int flag=0;
       System.out.print("Enter first number:");
      
       while(flag==0){
       num1=sc.next();
       try{
   Integer.parseInt(num1); //checking to convert the string into integer
   flag=1;
}catch(NumberFormatException e){ //if it throw an Exception then
   System.out.print("Enter first number correctly:");
   flag=0;
}
       }
       System.out.print("Enter second number:");
      
       flag=0;
       while(flag==0){
       num2=sc.next();
       try{
   Integer.parseInt(num2); //checking to convert the string into integer
   flag=1;
}catch(NumberFormatException e){ //if it throw an Exception then
   System.out.print("Enter second number correctly:");
   flag=0;
}
       }
       sum=Integer.parseInt(num1)+Integer.parseInt(num2); //finding sum
       System.out.println("Sum is "+sum);
      
   }
}

Screenshot of the code

{ 1 import java.util.Scanner; //importing Scanner class 2 public class Main 3 4. public static void main(String[] args) { 5 Scanner sc=new Scanner(System.in); 6 String num1="", num2=""; //declaring two number variables as string 7 int sum; //variable to store sum of numbers 8 int flag=0; 9 System.out.print("Enter first number:");| 10- while(flag==0){ 11 num1=sc.next(); 12 try{ 13 Integer.parseInt(numl); //checking to convert the string into integer 14 flag=1; 15 }catch(Number FormatException e) { //if it throw an Exception then 16 System.out.print("Enter first number correctly:"); 17 flag=0; 18 19 } 20 System.out.print("Enter second number:"); 21 flag=0; 22 - while(flag==0){ 23 num2=sc.next(); try{ 25 Integer.parseInt(num2); //checking to convert the string into integer 26 flag=1; 27 }catch(Number FormatException e) { //if it throw an exception then 28 System.out.print("Enter second number correctly:"); 29 flag=0; 30 } 31 32 sum=Integer.parseInt(num1)+Integer.parseInt(num2); //finding sum 33 System.out.println("Sum is "+sum); 34 } 35 } 36 } 24 - y

Output

Enter first number:43 Enter second number:13 Sum is 56

Enter first number:ok Enter first number correctly:23 Enter second number:k Enter second number correctly:/; Enter second number correctly: 65 Sum is 88

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