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Activecode Exercises

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

Write a program that prints out the even numbers between 20 and 40, inclusive.

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

Below is one way to write the program

#include <iostream> using namespace std; int main() { int n = 20; while (n <= 40){ cout << n << endl; n = n + 2; } }

Write a program that counts down from 100 to 0 in decrements of 10.

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

Below is one way to write the program

#include <iostream> using namespace std; int main() { int n = 100; while (n >= 0){ cout << n << endl; n -= 10; } }

Write a program that finds the sum of the first 10 natural numbers.

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

Below is one way to write the program.

#include <iostream> using namespace std; int main() { int n = 1; int sum = 0; while (n <= 10) { sum = sum + n; n++; } }

Write a function, repreatHello, that is a void function that takes no arguments and uses a while loop to print out “hello” three times.

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

Below is one way to write the function

#include <iostream> using namespace std; void repeatHello() { int n = 0; while (n < 3) { cout << "hello" << endl; n++; } } int main() { repeatHello(); }

Now let’s generalize the repeatHello function so that it repeats a given string three times. Let’s write the code for the repeatString function, which takes input as a parameter and uses a while loop to print out the string three times.

#include <iostream> using namespace std; // YOUR CODE HERE // DO NOT MODIFY BELOW THIS LINE int main() { repeatString("Hello world"); }

Below is one way to write the function.

#include <iostream> using namespace std; void repeatString (string input) { int n = 0; while (n < 3) { cout << input << endl; n++; } } int main() { repeatString("Hello world"); }

We can further generalize repeatString so that it repeats a given string a given number of times. Let’s write the code for the new repeatString function, which takes input and x as parameters and uses a while loop to print out the string x number of times.

#include <iostream> using namespace std; // YOUR CODE HERE // DO NOT MODIFY BELOW THIS LINE int main() { repeatString("Hello world!", 5); }

Below is one way to write the function

#include <iostream> using namespace std; void repeatString (string input, int x) { int n = 0; while (n < x) { cout << input << endl; n = n + 1; } } int main() { repeatString("Hello world!", 5); }

On the last day of every year, we count down the seconds before the new year arrives. Write the function newYearCountdown, which prints out a countdown from 10 and then prints out “Happy New Year!”.

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

Below is one way to write the function.

#include <iostream> using namespace std; void newYearCountdown() { int n = 10; while (n > 0) { cout << n << " "; n--; } cout << "Happy New Year!" << endl; } int main() { newYearCountdown(); }

Help Goku reach power levels of over 9000! Write the function powerUp which takes powerLevel as a parameter. powerUp checks to see if powerLevel is over 9000. If it isn’t, it repeatedly prints “More power!” and increments powerLevel by 1000 until powerLevel is over 9000. Then powerUp prints “It’s over 9000!”. Write the necessary code for the powerUp function.

#include <iostream> using namespace std; // YOUR CODE HERE // DO NOT MODIFY BELOW THIS LINE int main() { powerUp(5000); }

Below is one way to write the function

#include <iostream> using namespace std; void powerUp (int powerLevel) { while (powerLevel < 9000) { cout << "More power!" << endl; powerLevel = powerLevel + 1000; } cout << "It's over 9000!" << endl; } int main() { powerUp(5000); }

Write the function summation which takes two parameters, start and end. summation adds all the integers from start to end, inclusive, together and returns the sum. Write the necessary code for the summation function.

#include <iostream> using namespace std; // YOUR CODE HERE ==== #define CATCH_CONFIG_MAIN #include <catch.hpp> TEST_CASE("summation function") { REQUIRE(summation(1,5) == 15); REQUIRE(summation(1,9) == 45); REQUIRE(summation(1,20) == 210); }

Below is one way to write the function

#include <iostream> using namespace std; int summation (int start, int end) { int n = start; int sum = 0; while (n <= end) { sum = sum + n; n++; } return sum; } int main() { summation(1,10); } ==== #define CATCH_CONFIG_MAIN #include <catch.hpp> TEST_CASE("summation function") { REQUIRE(summation(1,5) == 15); REQUIRE(summation(1,9) == 45); REQUIRE(summation(1,20) == 210); }

Write the function reverseNumber which takes num as a parameter and returns num but with its digits reversed. For example, reverseNumber (1324) returns 4231. Write the necessary code, with reverse declared first, then temp, and lastly remainder.

#include <iostream> using namespace std; // YOUR CODE HERE ==== #define CATCH_CONFIG_MAIN #include <catch.hpp> TEST_CASE("reverseNumber function") { REQUIRE(reverseNumber(1324) == 4231); REQUIRE(reverseNumber(4231) == 1324); REQUIRE(reverseNumber(1) == 1); }

Below is one way to write the function

#include <iostream> using namespace std; int reverseNumber (int num) { int reverse = 0; int temp = num; int remainder = 0; while (temp > 0) { remainder = temp % 10; reverse = reverse * 10 + remainder; temp = temp / 10; } return reverse; } ==== #define CATCH_CONFIG_MAIN #include <catch.hpp> TEST_CASE("reverseNumber function") { REQUIRE(reverseNumber(1324) == 4231); REQUIRE(reverseNumber(4231) == 1324); REQUIRE(reverseNumber(1) == 1); }

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