Question

chapter 2 introduction to c++

1. which of the following are not valid assignment statements? (circle all that apply.)

a) total = 9;
b) 72 = amount;
c) profit = 129
d) letter = w;

1. which of the following are not valid cout statements? (circle all that apply.)

a) cout << \hello world\;
b) cout << \have a nice day\
;
c) cout < value;
d) cout << programming is great fun;

1. assume w = 5, x = 4, y = 8, and z = 2. what value will be stored in result in each of the following statements?

a) result = x + y;
b) result = z * 2;
c) result = y / x;
d) result = y - z;
e) result = w % 2;

Explanation:

Question 15

• In C++, the left - hand side of an assignment statement must be a variable (l - value), not a constant (r - value).
• Option A: total = 9; Here, total is a variable, so this is a valid assignment.
• Option B: 72 = amount; The left - hand side is a constant (72), which is not allowed in an assignment statement. So this is invalid.
• Option C: profit = 129 is missing the semicolon at the end. In C++, statements must end with a semicolon. So this is an invalid assignment statement.
• Option D: letter = 'W'; letter is a variable and 'W' is a valid character literal, so this is a valid assignment.

• For cout statements in C++:
• The insertion operator is <<, not <. Also, string literals must be enclosed in double quotes properly, and variable names should be valid.
• Option A: cout << "Hello World"; This is a valid cout statement as it uses the correct insertion operator and a properly formatted string literal.
• Option B: `cout << "Have a nice day"

; The escape sequence
should be inside the double quotes. It should be cout << "Have a nice day
";` So this is invalid.

• Option C: cout < value; The insertion operator for cout is <<, not <. So this is invalid.
• Option D: cout << Programming is great fun; The text Programming is great fun is not enclosed in double quotes. It should be a string literal like cout << "Programming is great fun"; So this is invalid.

Step1: Identify the values of x and y

We know that \(x = 4\) and \(y=8\).

Step2: Perform the addition

We need to calculate \(x + y\), so \(4+8 = 12\). Then result will be assigned the value of \(x + y\).

Answer:

B. \(72=\text{amount};\), C. \(\text{profit}=129\)

Question 16