COSC1436 Exam Questions and Answers Latest Update Graded A+

COSC1436 Exam Questions and Answers Latest Update Graded A+

What's the difference between initializing a variable and assigning a value to a variable? - Answers
Assigning is storing a value into the variable's memory location. Once you assign a value, you can
reassign another value at any time.



Initializing is simply assigning a value to a variable for the first time.

Declare an integer variable called ageOfStudent and initialize it to 16. - Answers int ageOfStudent = 16;

Declare a doublevariable called tipRateandinitializeit to .20. - Answers double tipRate = .20;

Declare twostringvariables called firstName, and lastName, but do not initialize them to anything -
Answers string firstName, lastName;

Given an integer variable called ageOfStudent (assume it is already set), write a statement that will

display the value of ageOfStudent. - Answers cout << ageOfStudent;

Given a double variable called tipRate (assume it is already set to .20), write a statement that will

display the value of tipRate with two decimal places. - Answers cout << fixed << setprecision(2) <<
tipRate;

Given two string variables called firstName and lastName (assume they are both already

initialized), write a statement that will display the values of firstName followed by a space, followed

by the lastName - Answers cout << firstName << " " << lastName << endl;

Given two string variables called firstName and lastName (assume they are both already

initialized), write a statement that will display the values of lastName in a field of 20 spaces
(rightjustified), followed by the value of firstName in a field of 20 spaces, also right-justified). - Answers
cout << setw(20) << lastName << setw(20) << firstName;

Assume that m is an int variable that has already been given a value. Write a statement that prints

out the value of m in a field of 10 positions. - Answers cout << setw(10) << m;

Given two integer variables distance and speed, write an expression that

divides distance by speed using floating point arithmetic. - Answers (double) distance/speed

Assume that students is an integer variable containing the number of students in a school, and

that teachers is an integer variable containing the number of teachers in the same school. Write a

,statement that will print out the average number of students per teacher.

Keep in mind that we want the answer to have a decimal number.

Hint: You will need to use type-casting. You may use the long or short version of type casting - Answers
cout << (double) students/teachers;

. Given an int variable datum that has already been declared, write a statement that reads an integer

value from standard input into this variable. - Answers cin >> datum;

Given a string variable firstName that has already been declared, write a statement that reads a

name from standard input into this variable. - Answers cin >> firstName

n. Given a string variable firstAndLastName that has already been declared, write a statement that

reads an entire name (first and last name) from standard input into this variable. For example, the

user might enter "J. K. Rowling" or "Robyn Rihanna Fenty", or "Madonna", etc.... - Answers getline(cin,
firstAndLastName);

Write an if statement to determine if the int variable age is within the range of 0 through 17

(including both those ages). Simply write the: if (condition) - Answers if (age >= 0 && age <= 17)

. Write an if statement to determine if the int variable age is less than 0 or greater than 17. Simply

write the: if (condition) - Answers if (age < 0 | | age > 17)

. Assume the following:

if (funny == 5)

cout << "So funny!" << endl;

else if (funny == 10)

cout << "Seriously funny!" << endl;

else

{

cout << "ERROR!" << endl;

cout << "Incorrect choice!" << endl;

}

,Rewrite the above if statement as a switch - Answers switch (funny) {



case 5:

cout << "So funny!" << endl;

break



case 10:

cout << "Seriously funny!"<<endl;

break



default:

cout << " ERROR!" << endl;

cout << "Incorrent choice!" << endl;

}

Given the variable temperature write an expression that evaluates to true if and only if the

temperature is equal to 32. This is just the expression (e.g., A>B, A<=B, etc...). Do not use parenthesis or
an equal sign. - Answers temperature == 32

. Given the variables temperature and humidity, write an expression that evaluates to true if and

only if the temperature is greater than 90 and the humidity is less than 10.

Remember, this is just an expression (e.g., A>B, A==B, etc...). Do not use parenthesis or an equal

sign. - Answers temperature > 90 && humidity < 10

Assume the following:

int age;

int baby=child=teen=0;

cout << "Enter age of child: ";

cin >> age;

, Write the entire if/else-if/else statement that will:

• Increment by 1 the baby variable if the ageis between 0 and 2 (including both those values)

• Increment by 1 the child variable if the ageis between 3 and 12 (including both those values)

• Increment by 1 the teen variable if the age is between 13 and 17 (including both those values)

• Display an error message if the the age is less than 0 or greater than or equal to 18 - Answers if (age >=
0 && age <= 2)

baby++;



else if (age >= 3 && age <= 12)

child++;



else if (age >= 13 && age <= 17)

teen++;



else

cout << "ERROR";

. The formula to compute the circumference of a circle is (where r is the radius of the circle and =

3.14159):

circumference = 2r

Write C++ statements to do the following:

i. Declare a constant PI and initialize it to 3.14159



ii. Declare a variable radius of type double



iii. Declare a variable circ of type double