I have 2 variables, firstNum and secondNum, where firstNum must be less than secondNum.

I have to use while loops.

I'm trying to:

1.) Output the sum of all the even numbers between firstNum and secondNum inclusive.

2.) Output all the numbers and their squares between 1 and 10.

3.) Output the sum of the squares of all the odd numbers between firstNum and secondNum inclusive.

Post what code you already have and describe your problem

This is 3 parts of a larger problem; my problem here is I'm not sure how I would do these.

Edit: 1.) 2.) 3.) refer to parts C,D,E, respectively.

Here is my full code so far though.. :

//Ben Graham
// Program D
//Page 321 #9/10


import java.util.*;

public class ProgD
{
static Scanner console = new Scanner(System.in);

public static void main(String[] args)
{
int firstNum;
int secondNum;
int sumEven;
int sumSquareOdd;
char chCounter;
int counter;
//A
System.out.println("Enter two integers. The first number must be less than the second number.");
firstNum = console.nextInt();
secondNum = console.nextInt();

//B
if (firstNum % 2 == 0)
counter = firstNum + 1;
else
counter = firstNum;
while (counter <= secondNum)
{
System.out.print(counter + " ");
counter = counter + 2;
}
//Part C

//Part D

//Part E

//Part F
chCounter = 'A';

while (chCounter <= 'Z')
{
System.out.print(chCounter + " ");
chCounter++;
}
System.out.println();

}
}

This post was edited by ben_graham7 on Apr 2 2013 06:48pm

C builds on B. you found a way to iterate over all the even numbers between n1 and n2. to get the sum, just use another variable and add counter to it each time

D: loop from 1 to 10. for each number, print n and n*n

E: combine the previous two ideas

I attmepted D, then got this error message:

ProgD.java:48: error: variable chCounter might not have been initialized
while (chCounter <= 'Z')
^
1 error

Here's the full code now...

//Ben Graham
// Program D
//Page 321 #9/10


import java.util.*;

public class ProgD
{
static Scanner console = new Scanner(System.in);

public static void main(String[] args)
{
int firstNum;
int secondNum;
int sumEven;
int sumSquareOdd;
char chCounter;
int counter;
//A
System.out.println("Enter two integers. The first number must be less than the second number.");
firstNum = console.nextInt();
secondNum = console.nextInt();

//B
if (firstNum % 2 == 0)
counter = firstNum + 1;
else
counter = firstNum;
while (counter <= secondNum)
{
System.out.print(counter + " ");
counter = counter + 2;
}
//Part C

//Part D
counter = 1;
System.out.print(counter + " " + counter * counter);
while (counter <= 10)


//Part E

//Part F
chCounter = 'A';

while (chCounter <= 'Z')
{
System.out.print(chCounter + " ");
chCounter++;
}
System.out.println();

}
}

Found the problem there, but now I'm not getting the output that I want.
I am getting this:
The numbers I used were 1 and 11 by the way.

1 3 5 7 9 11 1 12 43 94 165 256 367 498 649 8110 100A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

with this code:

//Ben Graham
// Program D
//Page 321 #9/10


import java.util.*;

public class ProgD
{
static Scanner console = new Scanner(System.in);

public static void main(String[] args)
{
int firstNum;
int secondNum;
int sumEven;
int sumSquareOdd;
char chCounter;
int counter;
//A
System.out.println("Enter two integers. The first number must be less than the second number.");
firstNum = console.nextInt();
secondNum = console.nextInt();

//B
if (firstNum % 2 == 0)
counter = firstNum + 1;
else
counter = firstNum;
while (counter <= secondNum)
{
System.out.print(counter + " ");
counter = counter + 2;
}
//Part C

//Part D
counter = 1;
while (counter <= 10)
{System.out.print(counter + " " + counter * counter);
counter++;
}

//Part E

//Part F
chCounter = 'A';

while (chCounter <= 'Z')
{
System.out.print(chCounter + " ");
chCounter++;
}
System.out.println();

}
}

This post was edited by ben_graham7 on Apr 2 2013 07:13pm

D is fixed.

This post was edited by ben_graham7 on Apr 2 2013 07:17pm

Finished the problem; Thanks.