Question

C++ Give the value of each of the following:

a. 7 / 2
d. static_cast(7) / 2
b. 7 / 2.0
e. static_cast (7 / 2)
c. 7 % 2
f. (4 + 3) / 2

Answer 1

In C++, expressions involving division and modulo operators have different outcomes based on whether the operands are integers or floating-point numbers. The use of static_cast can also alter the results by changing the type before the operation.

Step-by-step explanation:

The student has asked for the value of various expressions in the C++ programming language. Here are the answers:

• a. 7 / 2 yields 3. This is because when two integers are divided in C++, the result is also an integer with any decimal part discarded.
• b. 7 / 2.0 yields 3.5. Here, one operand is a floating-point number, so C++ performs floating-point division.
• c. 7 % 2 yields 1. The modulo operator (%) returns the remainder of the division of two integers.
• d. static_cast(7) / 2 yields 3.5. The static_cast converts the integer 7 to a floating-point before performing the division.
• e. static_cast (7 / 2) yields 3. The expression inside the static_cast is evaluated first, resulting in integer division, then the result is cast to an integer, although it already is one.
• f. (4 + 3) / 2 yields 3. The sum of 4 and 3 is 7, which is then divided by 2 using integer division.

Note that for part d there appears to be a typo in the original question and should likely include a destination type for the static_cast.