I am confused on a control question, class JMM110 { public static void main (String[] args) { int j = 0; do for (int i = 0; i++ < 2 System.out.print(i); while (j++ < 2); }} answer = Prints: 121212 This would make sense to me if it was i++ <= 2 and j++ <= 2, otherwise how does it get to 2 for either test.

in both conditional statements you use ++ POSTfix operator. It does the following: first returns the value of a variable, and then increaments it. so in the for loop i++ < 2 means: compare i to 2, then increament it. if i is 0 initially this would happen: is 0 less than 2? yes (the expression evaluates to true) now add 1 to i (i is 1) print i (which is 1) on the next iteration i is 1 so... is 1 less than 2? yes (the expression evaluates to true) now add 1 to i (i is 2) print i (which is 2) the next iteration breaks out of the loop since 2 is not less than 2 change the postfix ++ to prefix and you'll get the desired results.

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so in the for loop you see what is happening, you start by making i=0, then check 0 < 2 then increment. so i=1, 1 < 2 then increment i=2, so output is 12 2 is not less than 2 so check while. while is o < 2 then increment so start the for loop again from the start so ouptut is: 1212 check while 1 < 2, true, so do the for loop again. ouptut is 121212 then check while. 2 is not less than 2 so false so stop the do statement. hope this helps you with the output. Davy

How simple does it have to be???

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