Description
Q1. Write a function
unsigned int myStrLen(const char* str) { … }
which operates similarly to the strlen() function in the standard C library, that is, it should return the number of characters in the C-style
string str that is passed to it.
Q2. Write a function
double average(double data[], int size) { … }
which takes an array of double values and calculates and returns their average. The “size” parameter specifies the length of the data array.
Q3. Write a function
bool isPrime(unsigned int num) { … }
which returns true if num is a prime number and returns false otherwise. Note: 0 and 1 are not prime numbers.
Q4. By using one for loop nested inside another for loop, write a function void twoDice() { … } that prints out all possible outcomes when of
two six-sided dice are thrown together. When you call your function, the output should appear as follows:
(1,1) (1,2) (1,3) (1,4) (1,5) (1,6) (2,1) (2,2) (2,3) (2,4) (2,5) (2,6) (3,1) (3,2) (3,3) (3,4) (3,5) (3,6) (4,1) (4,2) (4,3) (4,4)
(4,5) (4,6) (5,1) (5,2) (5,3) (5,4) (5,5) (5,6) (6,1) (6,2) (6,3) (6,4) (6,5) (6,6)
Add some additional code to your function so that it also calculates and prints out the probability that the sum of two dice values will be 6 or
greater.
Q5. Write a function void simplifyFraction(int & n, int & d) { … } which takes a fraction in the form n/d and reduces it to its simplest form.
For example, using the following test code in your main() function:
int numer = 234;
int denom = 832;
cout << numer << “\\” << denom << ” = “;
simplifyFraction(numer, denom);
cout << numer << “\\” << denom << endl; EE219: Assignment 2 https://loop.dcu.ie/mod/assign/view.php?id=1227275 2/7 should print out the following: 2340\832 = 45\16 Q6. Using the binary operators >> and &, write a function
string toBinaryString(int a) { … }
which returns a string of ‘0’ and ‘1’ characters that is the binary representation of the signed integer number a. For example, the following test code
in your main() function:
cout << ” 34 in binary is : ” << toBinaryString(34) << endl;
cout << “-10 in binary is : ” << toBinaryString(-10) << endl;
should print out
34 in binary is 00000000000000000000000000100010
-10 in binary is 11111111111111111111111111110110
Q7. Write a C++ class called Student, which stores a student’s first and last names (as separate private class members) and also stores the student’s
ID. Your class should also have the following public methods:
a default constructor which sets the student’s name to empty strings (“”) and the ID to zero
a constructor that allows a student object to be initialized with a first name, last name and ID
a print() method, which prints out all student details
Q8. Write a separate function (not a class method), of the form
void printStudents(Student students[], int size) { … }
which takes an array of Student objects (your C++ class from Q7.) and prints the details of each student in the array.
Q9. Write a C++ class called Circle which has x and y center coordinates and a radius as data members. The class should have the following
features:
A constructor which takes center coordinates x and y values and a radius value
An area method which returns the area of the circle as a double value
A display method which prints out the center, radius and area of the circle
A method bool intersects(const Circle & c) which checks if this ciricle intersects with another circle (You can the maths library functions as
needed)
Here’s some test code for your main method you can use to to test your class:
Circle c1(0,0,1);
Circle c2(1,1,0.5);
c1.display();
c2.display();
cout << “Intersects? ” << (c1.intersects(c2) ? ” yes” : ” no”) << endl;
and the output it should produce:
center=(0,0) radius=1 area=3.41416
center=(1,1) radius=0.5 area=0.85354
Intersects? yes
Submission status
Submission
status
Submitted for grading
Grading status Graded
