1. Suppose that x, y, and z are int variables, and x = 20, y = 30, and z = 40. D

Question

1. Suppose that x, y, and z are int variables, and x = 20, y = 30, and z = 40.

Determine whether the following expressions evaluate to true or false:

a. !(x > 10)

b. x <= 5 || y < 15

c. (x != 5) && (y != z)

d. x >= z || (x + y >= z)

e. (x <= y - 2) && (y >= z) || (z - 2 != 20)

2. Suppose that str1, str2, and str3 are string variables, and str1 = "English", str2 = "Physics", and str3 = "Computer Programming".

Evaluate the following expressions:

a. str1 >= str2

b. str1 != "english"

c. str3 < str2

d. str2 >= "Chemistry"

3. What is the output of the following statements?

a. if('+' < '*')

cout << "+*";

cout << "%%" << endl;

b. if(10 <= 2 * 5)

cout << "10 ";

cout << "2 * 5";

cout << endl;

c. if('a' < 'A')

{

cout << 'a';

cout << 'A';

}

cout << endl;

d. if("C++" >= "C--")

cout << "C++" << endl;

cout << "C--" << endl;

e. if("Sam" <= "Tom")

cout << "Sam Tom" << endl;

cout << "Tom Sam" << endl;

f. if(6 == 2 * 4 - 2)

cout << 3 * 4 / 6 – 8 << endl;

cout << "**" << endl;

4. What is the output of the following code?

int num = 20; //Line 1

double temp = 2.5; //Line 2

bool found; //Line 3

found = (num == 2 *static_cast<int>(temp) + 1); //Line 4

cout << "The value of found is: " << found << endl; //Line 5

5. If the number of items bought is less than 5, then the shipping charges are $5.00 for each item bought; if the number of items bought is at least 5, but less than 10, then the shipping charges are $2.00 for each item bought; if the number of items bought is at least 10, there are no shipping charges.

Correct the following code so that it computes the correct shipping charges.

if(0 < numOfItemsBought || numOfItemsBought <> 5)

shippingCharges = 5.00 * numOfItemsBought;

else if (5 <= numOfItemsBought && numOfItemsBought < 10);

shippingCharges = 2.00 * numOfItemsBought;

else

shippingCharges = 0.00;

Explanation / Answer

1. Suppose that x, y, and z are int variables, and x = 20, y = 30, and z = 40.

Determine whether the following expressions evaluate to true or false:

a. !(x > 10) = False

b. x <= 5 || y < 15 = False

c. (x != 5) && (y != z) True

d. x >= z || (x + y >= z) True

e. (x <= y - 2) && (y >= z) || (z - 2 != 20) True

2. Suppose that str1, str2, and str3 are string variables, and str1 = "English", str2 = "Physics", and str3 = "Computer Programming".

Evaluate the following expressions:

a. str1 >= str2 False

b. str1 != "english" True

c. str3 < str2 True

d. str2 >= "Chemistry" True

3. What is the output of the following statements?

a. if('+' < '*')

cout << "+*";

cout << "%%" << endl;

Output: %%

b. if(10 <= 2 * 5)

cout << "10 ";

cout << "2 * 5";

cout << endl;

output: 10 2 * 5

c. if('a' < 'A')

{

cout << 'a';

cout << 'A';

}

cout << endl;

output:

d. if("C++" >= "C--")

cout << "C++" << endl;

cout << "C--" << endl;

output: C--

e. if("Sam" <= "Tom")

cout << "Sam Tom" << endl;

cout << "Tom Sam" << endl;

ouput:Sam Tom
Tom Sam

f. if(6 == 2 * 4 - 2)

cout << 3 * 4 / 6 – 8 << endl;

cout << "**" << endl;

output:-6

**

4. What is the output of the following code?

int num = 20; //Line 1

double temp = 2.5; //Line 2

bool found; //Line 3

found = (num == 2 *static_cast<int>(temp) + 1); //Line 4

cout << "The value of found is: " << found << endl; //Line 5

The value of found is: 0

5.

if(0 < numOfItemsBought && numOfItemsBought <> 5)

shippingCharges = 5.00 * numOfItemsBought;

else if (5 <= numOfItemsBought && numOfItemsBought < 10);

shippingCharges = 2.00 * numOfItemsBought;

else

shippingCharges = 0.00;

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