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assertions

Language/Type: Java assertions
Author: Roy McElmurry (on 2010/12/28)

You will identify various assertions as being either always true, never true or sometimes true/sometimes false at various points in program execution. The comments in the method below indicate the points of interest. 

public static int antCrawl(int max) {
    Random rand = new Random();
    int height = 0;
    int falls = 0;

    // Point A
    while (height < max) {
        int r = rand.nextInt(4);

        // Point B
        if (r == 0 && height > 0) {
            height--;
            falls++;
            // Point C
        } else {
            height++;
            // Point D
        }
    }

    // Point E
    return falls;
}

Fill in each box of the the table below with ALWAYS, NEVER or SOMETIMES.

falls == 0 height > 0 height < max
Point A
Point B
Point C
Point D
Point E

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