Editing number fields

You will often encounter a picture similar to what you see below in examples and exercises.

What you see is an image of a green board with two numbers written on it in yellow chalk. One of the numbers is highlighted with a box with a deeper green color than the green board. The other number is not highlighted.

• How do I know if a number field can be edited (changed)?
• A number can be changed if it is highlighted with a deep green box on the chalkboard. Highlighting is the way that Eureka! tells you that a field can be edited.
• A number cannot be edited if it is not highlighted on the chalkboard.

• How do I change the complete number in the field?
• If you want to change the complete number you see in the highlighted box, do the following:
• Move the mouse cursor into the highlight box.
• Double click the left mouse button. The highlighting should change to blue.
• Type in the first digit of the new number. This digit should replace the original number. A flashing vertical cursor should appear to the right of the digit you typed.
• Continue to type digits as needed if necessary. The digits will appear in sequence to the right of the original digit.
• When you have entered the desired number, you are finished. There is no need to press ENTER on the keyboard. Eureka! does the rest.

• How do I change just a few digits of the number?
• If you want to change or delete a few digits, do the following:
• Move the mouse cursor into the highlighted box and position it to the left or right of the digits you want to change.
• Press the left mouse button and drag the cursor across the digits you want to change. The highlighting behind the selected digits should change to blue.
• Type in the new digits you want or press DEL on the keyboard to remove the selected digits.
• Again, there is no need to press ENTER on the keyboard.

• What happens if I type a character that does not belong in a number?
• Eureka! will not accept an incorrect character. If the character you type does not immediately appear in the field then it needs to be retyped.
• Be careful if you want to enter a negative number. A minus sign will be accepted if it is the first character of the field but not otherwise.

You should practice editing the number field until you feel skilled at it.