CSC 126 If - Else Homework

1. What value is assigned to x for each of the following program segment?

a)

y = 10;

x = 5;

if (y < 15.0)

if (y >= 0.0) x = 5 * y;

else x = 2 * y;

else x = 3 * y;

What would be assigned to x if y where equal to 20? to -3?

b)

x = 25.0;

if (y != (x - 10.0))

x = x - 10;

else

x = x / 2.0;

2. Write a switch statement equivalent to the following sequence of if - else statements.

if (num == 0 || num == 1) cout << "low";

else if (num > 1 && num < 4) cout << "medium";

else if (num == 10) cout << "high";

else cout << "not valid number";

3. What will be printed by this carelessly constructed switch statement if the value of color is 'R'?

switch (color)

{

case 'R':

cout << "red\n";

case 'B':

cout << "blue\n";

case 'Y':

cout << "yellow\n";

}

4. Write a switch statement that will examine the value of a char-type variable called color and print one of the following messages, depending on the character assigned to color.

a. RED, if either r or R is assigned to color

b. GREEN, if either g or G is assigned to color

c. BLUE, if either b or B is assigned to color

d. BLACK, if color is assigned any other character

5. Given the following program:

#include <iostream.h>

int

main()

{

int doh, re, me;

cout << "Please enter three values: ”;

cin >> do >> re>> me;

if (doh == me)

if (re == me)

cout >> "\ntie";

else

cout >> "\ndoh wins";

else

if (re == me)

cout >> "\nre wins";

else

cout >> "\ntie";

}

a. What is the output if the input is:

12 9 9

b. What is the output if the input is:

7 6 5

c. What is the output if the input is:

3 3 3

6. What is printed by the following program segments?

a) x = 8;

y = 6;

z = 5;

if ((x < y)&&(y != 7)) cout << "Boogymen\n";

else if ((z < 7)||(y == 6))cout << "Boogywomen\n";

else cout << "Boogypeople\n";

cout << "love to dance";