CMSC 140 FINAL EXAM REVIEW QUESTIONS
What does it mean to increment something? What operator is used in C++ to do this? -
Answer -To increment something is to increase its value by 1. The operator in C++ is
the ++ (plus-plus) operator.
What does it mean to decrement something? What operator is used in C++ to do this? -
Answer -To decrement something is to decrease its value by 1. The operator in C++ is
the -- (minus-minus) operator.
What is the difference in using a increment/decrement operator in postfix or prefix? -
Answer -In prefix mode, the value is incremented before used in any expression in the
same statement. In postfix mode, the value is incremented after used in any expression
in the same statement.
What does it mean to find the modulus of something? What operator is used in C++ to
do this? - Answer -To find the modulus is to find the remainder after the division of two
numbers. The operator % is used in C++.
What operator is used in C++ to represent division? - Answer -The / operator is used to
represent division in C++.
What will be the data type of the result of division between two integers? - Answer -The
data type will be an integer.
What will be the result of the expression ? What will be different compared to the
expression 7.? - Answer -3 - it will be different from the second expression, which
is 3.5, since because it is integer division any numbers after the decimal are ignored.
What will the variables 'someNum', 'anotherNum', 'lastNum', and 'aBool' contain after
the execution of the following code?
int someNum = 2, anotherNum = 3, lastNum = 1;
bool aBool;
aBool = !(++someNum > (--anotherNum * lastNum++)); - Answer -someNum: 3
anotherNum: 2
lastNum: 2
abool: false
Name the three different types of loops. - Answer -1. while loop
2. do-while loop
3. for loop
, For each type of loop, state if the loop is pretest or post test, and explain what that
means. - Answer -1. while loop: pretest, which means it will evaluate its expression
before the loop executes once.
2. do-while loop: post test, which means it will evaluate its expression after the loop
executes once
3. for loop: pretest, which means it will evaluate its expression before the loop executes
once.
What are the three parts of a for loop definition called? What do each of them do? -
Answer -The three parts of a for loop definition are initialization, test, and update.
initialization - the counter variable is initialized to a value. It executes once, the first time
the loop executes
test - the expression that evaluates to true or false, which controls the execution of the
loop
update - the expression that updates the counter variable. It executes at the end of each
loop.
What will be displayed on the screen after the execution of the following code?
int counter = 0;
bool moreThan20 = false;
while (!moreThan20)
{
if (counter != 6)
{
cout << counter << endl;
}
if (counter == 14)
{
cout << "...Getting close..." << endl;
}
else if (counter == 18)
{
cout << "...Almost there..." << endl;
}
if (counter > 20)
{
cout << "...It's over twenty..." << endl;
moreThan20 = true;
}
What does it mean to increment something? What operator is used in C++ to do this? -
Answer -To increment something is to increase its value by 1. The operator in C++ is
the ++ (plus-plus) operator.
What does it mean to decrement something? What operator is used in C++ to do this? -
Answer -To decrement something is to decrease its value by 1. The operator in C++ is
the -- (minus-minus) operator.
What is the difference in using a increment/decrement operator in postfix or prefix? -
Answer -In prefix mode, the value is incremented before used in any expression in the
same statement. In postfix mode, the value is incremented after used in any expression
in the same statement.
What does it mean to find the modulus of something? What operator is used in C++ to
do this? - Answer -To find the modulus is to find the remainder after the division of two
numbers. The operator % is used in C++.
What operator is used in C++ to represent division? - Answer -The / operator is used to
represent division in C++.
What will be the data type of the result of division between two integers? - Answer -The
data type will be an integer.
What will be the result of the expression ? What will be different compared to the
expression 7.? - Answer -3 - it will be different from the second expression, which
is 3.5, since because it is integer division any numbers after the decimal are ignored.
What will the variables 'someNum', 'anotherNum', 'lastNum', and 'aBool' contain after
the execution of the following code?
int someNum = 2, anotherNum = 3, lastNum = 1;
bool aBool;
aBool = !(++someNum > (--anotherNum * lastNum++)); - Answer -someNum: 3
anotherNum: 2
lastNum: 2
abool: false
Name the three different types of loops. - Answer -1. while loop
2. do-while loop
3. for loop
, For each type of loop, state if the loop is pretest or post test, and explain what that
means. - Answer -1. while loop: pretest, which means it will evaluate its expression
before the loop executes once.
2. do-while loop: post test, which means it will evaluate its expression after the loop
executes once
3. for loop: pretest, which means it will evaluate its expression before the loop executes
once.
What are the three parts of a for loop definition called? What do each of them do? -
Answer -The three parts of a for loop definition are initialization, test, and update.
initialization - the counter variable is initialized to a value. It executes once, the first time
the loop executes
test - the expression that evaluates to true or false, which controls the execution of the
loop
update - the expression that updates the counter variable. It executes at the end of each
loop.
What will be displayed on the screen after the execution of the following code?
int counter = 0;
bool moreThan20 = false;
while (!moreThan20)
{
if (counter != 6)
{
cout << counter << endl;
}
if (counter == 14)
{
cout << "...Getting close..." << endl;
}
else if (counter == 18)
{
cout << "...Almost there..." << endl;
}
if (counter > 20)
{
cout << "...It's over twenty..." << endl;
moreThan20 = true;
}
