Chapter 4 Loops
1. count < 100 always true at Point A. count < 100 always
false at Point C. count < 100 is sometimes true or sometimes
false at Point B.
2. It would be wrong if it is initialized to a value between 0 and 100, because it could
be the number you attempt to guess.
3. (a) Infinite number of times.
(b) The loop body is executed nine times. The printout is 2, 4, 6, 8 on
separate lines.
(c) The loop body is executed nine times. The printout is 3, 5, 7, 9 on
separate lines.
4. The difference between a do-while loop and a while loop is the order of
evaluating the continuation-condition and executing the loop body. In a while loop,
the continuation-condition is checked and then, if true, the loop body is executed. In a
do-while loop, the loop body is executed for the first time before the continuation-
condition is evaluated.
int sum = 0 ;
int number;
cin >> number;
do
{
sum += number;
cin >> number;
} while (number != 0 );
5. Same. When the i++ and ++i are used in isolation, their effects are same.
6. The three parts in a for loop control are as follows:
The first part initializes the control variable.
The second part is a Boolean expression that determines whether the loop will
repeat.
The third part is the adjustment statement, which adjusts the control variable.
7. The loop keeps doing something indefinitely.
8. No. The scope of the variable is inside the loop.
9.
max is 5
