Algebra

Many times a programmer is given an algebraic formula, and must write an assignment statement that will correctly calculate the answer. After writing a statement, check it by hand, using sample values and
the method shown above to verify that the equation is correct. Use the following guidelines to convert algebraic expressions to programming statements:

Algebra	Program	Explanation:
XY	$x*$y	Algebra uses single letters for variables, and can omit the *, programming languages always require an operator.
X·Y	$x*y	Algebra sometimes uses a dot for multiplication.
2X	$x*2	Programming languages always require an operator.
	$x*$x	There is no way to type a smaller exponent.
	pow($x,$n)	PHP has lots of built in functions, check the manual!
	sqrt($x)	another built in function
	($a+$b)/$c	Compound numerators and divisors must be enclosed in parenthesis: Notice the difference between this example and the next one.
	$a+$b/$c

Remember: Algebra uses single letters for variables: programmers should use good variable names wherever possible!

Note: While you are looking at all of built in functions, take a look at the rand function, then go to the test page to roll dice.

rand returns a random integer number. If we find the remainder when dividing by 6 we get a value from 0 to 5. Add 1 to get values from 1 to 6.

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Algebra