notes/education/software development/ECE1400/Chapter 6 Exercises.md

1. What output does the following program fragment produce?

i = 1;
while (i <= 128) {
	printf("%d ", i);
	i *= 2;
}

Output:

1 2 4 8 16 32 64 128

2. What output does the following program fragment produce?

i = 9384
do {
	printf("%d ", i);
	i /= 10;
} while (i <= 128);

Output:

9384 938 93 9

3. What output does the following for statement produce?

for (i = 5, j = i - 1; i > 0, j > 0; --i, j = i - 1)
	printf("%d ", i);

Output:

5 4 3 2

4. Which one of the following statements is not equivalent to the other two (assuming that the loop bodies are the same?)

for (i = 0; i < 10; i++) // (a)
for (i = 0; i < 10; ++i) // (b)
for (i = 0; i ++ < 10; ) // (c)

Answer: C is not the same as A and B, because the increment takes place before the loop body is executed.

5. Which one of the following statements is not equivalent to the other two (assuming that the loop bodies are the same)?

while (i < 10) {...} // (a)
for (; i < 10;) {...} // (b)
do {...} while (i < 10); // (c)

Answer: C is not the same as A and B, because the block is executed before the condition is checked.