The Knowledge Of Sauron's Minions
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# Print out the value of compute with the proper incantation. What have we wrought? | # Print out the value of compute with the proper incantation. What have we wrought? | ||
# Look on my page for "References", and click on Math. Explore therein and find the secrets of exponentiation and other precalculus functions. | # Look on my page for "References", and click on Math. Explore therein and find the secrets of exponentiation and other precalculus functions. | ||
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| + | ==Multitudinous Variables== | ||
| + | As yet we have examined only singular variables. In mathematical lore, we often use variables that contain multitudes, as in matrices. In Java, we have row matrices, called '''arrays'''. Arrays can be of any type. We specify an array of a type by placing square brackets '[]' after the type. | ||
| + | * Add 'int[] anArray = {8, 2, 5};' to the variables at the top of RingWraith. | ||
| + | In math, we would express this as: | ||
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| + | anArray = [8 2 5] | ||
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| + | In math, we would use subscripts to specify which of the numbers to select, subscripts from 1 to 3. But '''in Java subscripts start at zero''' and '''subscripts are numbers within square brackets'''. | ||
| + | * Add 'System.out.println( anArray[0] + anArray[1] + anArray[2] );' into main(). What does this do? | ||
| + | * You might notice that the array was initialized to three values by placing the set of values in curly braces. Where else have we used curly braces? | ||
| + | * Add another value to the array by putting another number within the curly braces. | ||
| + | * Change one of the array values by adding this line in main(): 'anArray[1] = -3;'. Can you write a set of println() to show all the array values, and see which has changed? | ||
