COSC1436 Questions With Solved Solutions.

COSC1436 Questions With Solved Solutions

What's the difference between initializing a variable and assigning a value to a variable? -
ANSWER>>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. - ANSWER>>int
ageOfStudent = 16;

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

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

Given an integer variable called ageOfStudent (assume it is already set), write a statement that
will
display the value of ageOfStudent. - ANSWER>>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. - ANSWER>>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 - ANSWER>>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). -
ANSWER>>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. - ANSWER>>cout << setw(10) << m;

Given two integer variables distance and speed, write an expression that
divides distance by speed using floating point arithmetic. - ANSWER>>(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 -
ANSWER>>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. - ANSWER>>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. - ANSWER>>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.... -
ANSWER>>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) - ANSWER>>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) - ANSWER>>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 - ANSWER>>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. - ANSWER>>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. - ANSWER>>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 -
ANSWER>>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

iv. Prompt the user for the radius and then read in the value into the variable radius

v. Calculate the circumference of the circle and store it in the variable circ.

vi. Display the computed circ on the console in the following format (where xxxxx is whatever
was stored in the value of circ):
Circumference = xxxxx