Activecode Exercises

Answer the following Activecode questions to assess what you have learned in this chapter.

Construct a block of code that prints the remainder of 18 when divided by 13.

#include <iostream> using namespace std; // YOUR CODE HERE

Below is one way to write the code to print the remainder of 18 when divided by 13.

#include <iostream> using namespace std; int main () { int x = 18; int y = 13; cout << x % y; }

Construct a function, is_even, that prints whether a number is even.

#include <iostream> using namespace std; // YOUR CODE HERE // DO NOT MODIFY BELOW THIS LINE int main() { is_even(4); is_even(3); is_even(0); }

Below is one way to construct the is_even function.

#include <iostream> using namespace std; void is_even (int number) { if (number % 2 == 0) { cout << true; } else { cout << false; } } int main() { is_even(4); is_even(3); is_even(0); }

Construct a function, difference, that prints the difference of a and b if the result would result in a positive number. Otherwise, prints -1.

#include <iostream> using namespace std; // YOUR CODE HERE // DO NOT MODIFY BELOW THIS LINE int main() { int a = 25; int b = 10; difference(a,b); }

Below is one way to write the difference function.

#include <iostream> using namespace std; void difference (int a, int b) { if (a - b > 0) { cout << a - b; } else { cout << -1; } } int main() { int a = 25; int b = 10; difference(a,b); }

Construct a function, matic, that takes as inputs 2 integers, x and y, and prints “automatic” if x is an odd number, “systematic” if x is greater than y, AND “hydromatic” if y is not equal to x. Check all 3 conditions.

#include <iostream> using namespace std; // YOUR CODE HERE

Below is one way to construct the code.

#include <iostream> using namespace std; void matic(int x, int y) { if (x % 2 > 0) { cout << "automatic"; } if (x > y) { cout << "systematic"; } if (y != x) { cout << "hydromatic"; } } int main() { matix(5,4); }

Construct a block of code that prints “Pick me!” if x is equal to y, “Choose me!” if x is less than y, OR “Love me!” if x + y is even.

#include <iostream> using namespace std; // YOUR CODE HERE

Below is one way to construct the code.

#include <iostream> using namespace std; int main() { if (x == y) { cout << "Pick me!"; } else if (y > x) { cout << "Choose me!"; } else if ((x + y) % 2 == 0) { cout << "Love me!"; } }

Construct a function, printLetterGrade, that prints your letter grade according to this scheme. [0, 70) = F, [70, 80) = C, [80, 90) = B, and [90, 100] = A.

#include <iostream> using namespace std; // YOUR CODE HERE // DO NOT MODIFY BELOW THIS LINE int main() { double grade = 90.0; printLetterGrade(grade); }

Below is one way to write the printLetterGrade function.

#include <iostream> using namespace std; void printLetterGrade (double grade) { if (grade < 70) { cout << "F"; } else if (grade < 80) { cout << "C"; } else if (grade < 90) { cout << "B"; } else { cout << "A"; } } int main() { double grade = 90.0; printLetterGrade(grade); }

According to a logic game, a knight is someone who cannot tell a lie, and a knave is someone who cannot tell the truth. Construct a function that takes two booleans: the truth value of the story, and the truth value told by the person. The function should print whether the person was a knight or a knave.

#include <iostream> using namespace std; // YOUR CODE HERE

Below is one way to construct the knightKnave function.

#include <iostream> using namespace std; void knightKnave (bool truth, bool told) { if (truth == true) { if (told == true) { cout << "Knight"; } else { cout << "Knave"; } } else { if (told == true) { cout << "Knave"; } else { cout << "Knive"; } } }

If a cat is in a good mood, it purrs; when it’s in a bad mood, it meows. If a doog is in a good mood, it barks; when it’s in a bad mood it woofs. Construct a function that accomplishes this.

#include <iostream> using namespace std; // YOUR CODE HERE

Below is one way to construct the makeVocals function.

#include <iostream> using namespace std; void makeVocals (string animal, string mood) { if (mood == "bad") { if (animal == "dog") { cout << "Woof!" << endl; } else { cout << "Meow!" << endl; } } else { if (animal == "dog") { cout << "Bark!" << endl; } else { cout << "Purr!" << endl; } } } int main() { makeVocals("dog","good"); makeVocals("cat","bad"); }

Construct a recursive function that tells the user to enter a positive number. It should then output that number to the terminal. If the user enters a negative number or zero, prompt the user again.

#include <iostream> using namespace std; // YOUR CODE HERE

Below is one way to write the takeSum recursive function.

#include <iostream> using namespace std; void takeSum () { cout << "Input a positive number!"; int num; cin >> num; if (num < 0) { takeSum (); } // END "if" cout << num; } // END function int main() { takeSum(); }

In the table of ASCII characters, the lowercase alphabet consists of characters 97-122. The uppercase alphabet consists of characters 65-90, which is a 32 character shift back from the lowercase. Construct a recursive function that asks the user to input a LOWERCASE character, converts that character to UPPERCASE character and prints it. If the user enters a character outside of the range of the LOWERCASE alphabet, prompt the user again. Hint: “||” means “or” when used between two conditional statements.

#include <iostream> using namespace std; // YOUR CODE HERE

Below is one way to write the capitalize function.

#include <iostream> using namespace std; void capitalize () { cout << "Input a lowercase character!"; char let; cin >> let; if (int(let) < 97 || int(let) > 122) { capitalize (); } let = let - 32; cout << char(let); } int main() { capitalize(); }

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