Try to make the operator tree as soon a button is pressed. Keep on updating the tree as more buttons are pressed. Parsing a whole equation string can be a difficult task. After the user press Enter, solve your operator tree. This has many benefits. 1) You will not have to deal with parsing one operand/operator at a time. 2) A correct in-order tree traversal will take care of BODMAS rule and other nitty-gritty of mathematical operators.
3) An in-order traversal will give you the original equation the user typed, which you can show him back.
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Basic Operations Operation Function + Addition - Subtraction (not negative) x Multiplication (There is often an x key for variables as well) ÷ Division ^ Raise to the power of y x y to the power of x √ or Sqrt Square root e x Exponential sin Sine function sin -1 Inverse sine function cos Cosine function cos -1 Inverse cosine function tan Tangent function tan -1 Inverse tangent function ln Log to the base of e log Log base 10 (-) or neg Denotes negative number Parentheses for denoting order of operations π Inserts pi Mode Switches between degrees and radians. Try a simple square root.
Test out the button order on an easy and quick problem. For example, try taking the square root of 9. Seattle, WA. You should already know that the answer will be three, so this is a great tip to use in the middle of a test if you forget which order you're supposed to be pressing buttons. Press 9 and then the checkmark key.
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If nothing happens, press the checkmark key and then press 9. Some calculators will add parentheses to the calculation, such as √(3.
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You will need to add the closing parenthesis ) before completing the calculation. You may have to press the equals key to see the results. Practice the trigonometry functions. When you are using the SIN, COS, or TAN functions, you will have to keep in mind two different things: the order of the button presses, and radians versus degrees. Perform a simple SIN function with an easy to remember answer.
For example, the sine of 30° is 0.5. Determine if you need to enter 30 first or press sin first. Check your answer. If you get 0.5, then your calculator is set to display in degrees.
If your answer is.988, then your calculator is set to radians. Look for the Mode button to switch.