8 Your HP-10C: A Problem Solver
left corner of the display when the calculator is turned on
signifies that the available battery power is running low. To install
new batteries, refer to appendix C.
Manual Solutions
It is not necessary to clear the calculator between problems. But if you make a
digit entry mistake, press ` and key in the correct number.
*
To Solve: Keystrokes Display
9 + 6 = 15
9 v 6 +
15.0000
9 − 6 = 3
9 v 6 -
3.0000
9 × 6 = 54
9 v 6 *
54.0000
9
÷ 6 = 1.5
9 v 6 ÷
1.5000
Notice that in the four examples:
• Both numbers are in the calculator before you press +, -, *, or
÷.
• v is used only to separate two numbers that are keyed in one after
the other.
• Pressing a numerical function key, in this case +, -, *, or ÷
causes the function to execute immediately and the result to be displayed.
To see the close relationship between manual and programmed problem-
solving, let's first calculate the solution to a problem manually, that is, from the
keyboard. Then we'll use a program to calculate the solution to the same
problem and others like it.
Most conventional home water heaters are cylindrical in shape. You can easily
calculate the heat loss from such a tank using the formula q = h × A × T, where:
*
If you are new to HP calculators, you will notice most keys have two labels. For the
main function—printed in white on top of the key—just press that key. For the function
printed in gold, press the ´ key first.
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