while loop to for loops

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Cathy Dinh

while loop to for loops
2 Answer(s) 2 years and 6 months ago
Posted in : Java Beginners

I have to change this while loops to for loops and I was wondering if you could help me out. I got the codes just need to know how to change it.

    int currentNum= num1;

    while(num1>num2){
        if (currentNum % 2 == 0){
            System.out.print("Even numbers:  "+currentNum);
        }
        else{
            System.out.print("Odd numbers : "+currentNum);
        }
    }

     // output odds number, square of odd numbers and sum of even numbers
     System.out.print("Odd Numbers Are: ");

     while(num1 <= num2) {
        if(num1%2 != 0) {
            System.out.print(" "+num1);
            sumSquares+=(num1*num1);
        }
        if(num1%2 == 0) {
            sum+=num1;
        }
            num1++;
    }

        System.out.println( );
        System.out.println("Sum of square of odd numbers are: "+sumSquares);
        System.out.println("Sum of even numbers are: "+sum);

        System.out.printf("%-10s%-10s%n","Numbers", "Squares");
        System.out.printf("%-10s%-10s%n", "------","------");

    //while loop to output  1- 10 and there squares
    int i=1;
    while(i <= 10) {
        System.out.printf("%-13s%-13s%n",i,(i*i));
        i++;
    }

    // while loop to output uppercase letter from 'A' - 'Z'
     System.out.print("Letters : ");
     char letter = 'A';
     while (letter <= 'Z'){
        System.out.print(" "+letter);
        letter++;
     }
        System.out.println();

View Answers

November 24, 2010 at 12:23 PM

Hi Friend,

Here is your code:

import java.util.*;
public class NumberExample{
    public static void main(String[]args){
        int sum=0,sumSquares=0;
        int num1=0,num2=0;
    Scanner input=new Scanner(System.in);
    System.out.print("Enter First Number: ");
     num1=input.nextInt();

    System.out.print("Enter Second Number: ");
     num2=input.nextInt();

    if(num1>num2){
    System.out.print("Your First Number is greater than second.So Please re-enter: ");
    num1=input.nextInt();
    }
    else{
        System.out.println("Odd Numbers: ");
    for(int i=num1;i<=num2;i++){
if(i%2 != 0) {
System.out.println(i);
sumSquares+=(i*i);
}
if(i%2 == 0) {
sum+=i;
}
}
System.out.println("Sum Of Even Numbers: "+sum);
System.out.println("Numbers and their squares between 1 and 10");
for(int i=1;i<=10;i++){
System.out.println(i+"    "+(i*i));
}
System.out.println("Sum Of square of odd Numbers: "+sumSquares);

System.out.print("Letters : ");
     char letter = 'A';
     for(int i='A';i<='Z';i++){
        System.out.print(" "+letter);
        letter++;
     }
        System.out.println();
}
    }
}

Thanks

November 24, 2010 at 12:23 PM

Hi Friend,

Here is your code:

import java.util.*;
public class NumberExample{
    public static void main(String[]args){
        int sum=0,sumSquares=0;
        int num1=0,num2=0;
    Scanner input=new Scanner(System.in);
    System.out.print("Enter First Number: ");
     num1=input.nextInt();

    System.out.print("Enter Second Number: ");
     num2=input.nextInt();

    if(num1>num2){
    System.out.print("Your First Number is greater than second.So Please re-enter: ");
    num1=input.nextInt();
    }
    else{
        System.out.println("Odd Numbers: ");
    for(int i=num1;i<=num2;i++){
if(i%2 != 0) {
System.out.println(i);
sumSquares+=(i*i);
}
if(i%2 == 0) {
sum+=i;
}
}
System.out.println("Sum Of Even Numbers: "+sum);
System.out.println("Numbers and their squares between 1 and 10");
for(int i=1;i<=10;i++){
System.out.println(i+"    "+(i*i));
}
System.out.println("Sum Of square of odd Numbers: "+sumSquares);

System.out.print("Letters : ");
     char letter = 'A';
     for(int i='A';i<='Z';i++){
        System.out.print(" "+letter);
        letter++;
     }
        System.out.println();
}
    }
}

Thanks

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