cgi scripting

cgi scripting Since we started counting at zero there is no k[3], and trying to access it will generate an ArrayIndexOutOfBoundsException. You can use array elements wherever you'd use a similarly typed variable that wasn't part of an array.Here's how we'd store values in the arrays we've been working with:k[0] = 2; k[1] = 5; k[2] = -2; yt[6] = 7.5f; names[4] = "Fred"; This step is called initializing the array or, more precisely, initializing the elements of the array. Sometimes the phrase "initializing the array" would be reserved for when we initialize all the elements of the array.

cgi scripting For even medium sized arrays, it's unwieldy to specify each element individually. It is often helpful to use for loops to initialize the array. For instance here is a loop that fills an array with the squares of the numbers from 0 to 100.float[] squares = new float[101];for (int i=0; i <= 100; i++) { squares[i] = i*i; } Two things you should note about this code fragment: Watch the fenceposts! Since array subscripts begin at zero we need 101 elements if we want to include the square of 100. Although i is an int it becomes a float when it is stored in squares, since we've declared squares to be an array of floats.

cgi scripting One way to avoid fencepost errors is to use the array's built-in length member. This tells you the number of components in the array. In the example above, squares.length equals 101. Thus the loop could have been written like this: float[] squares = new float[101];for (int i=0, i < squares.

cgi scripting

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