CS 131 Chapter 3 Exercises

1.
Errors:
* Syntax (in C++ "grammar", detected during compilation).
* Run-Time (the program is syntactically correct, but fails when running).
* Logical (the program runs but produces incorrect output).

4.

a. 3
b. 3.25
c. 1
d. 3.25
e. 3
f. syntax error (% only applies to int)

5.
a. 13
b. 5
c. 32
d. 1
e. 6
f. 32

7.
a. x -= 0.01
b. seconds += (60*minutes)
c. Can't be rewritten with an arithmatic assignment operator since wages is not on the right side.

8.
a. salary = salary + bonus
b. seconds = seconds - 1
c. annual_int_rate = annual_int_rate / 100.0
d. total_cost = total_cost * (1.0 + SALES_TAX_RATE)

9.
a.  (x + y) / (2 * w)
b.  (5 * x - 3 * y) / 2

11. 

13 7

14.
The output will be:
$9
80 116


15.
The output will be:
1 Hi there.
2 Hi there.
3 Hi there.
Bye now.

16.

a. The output is:
   4 Hi there.
   Bye now.

The semicolon stops the loop after incrementing n three times. At the exit,
n is 4 and is printed by the cout.

b. The output is:
   1 Hi 2 Hi 3 Hi there.
   Bye now.
The loop only extends to the first line after the for.

17. Output:
How many times: 3
Enter an int: 7
7 7
Enter an int: 12
12 19
Enter an int: 5
5 24