Welcome to Lesson 16!

Announcements

• Midterm 2 after a short review lesson and the break
• Don't forget Assignment 15 due Monday
• Get started early! It is a very long assignment with a lot of practice on functions!
  
• Don't forget Lab 8 due Friday
• Next quiz one week from today
• Functions!
• Typo in answer key question 5
• Update statement should have been in body of while loop

Review Activity

With a partner, answer the following questions:

• Label the components of the following function:

double calc_area_circle(int radius) {

    double area = 3.14 * radius * radius;

    return area;

}

Function Name:

Return type:

Parameter(s):

• Write a correct function call for the above function, passing it the value of 9, and storing the result in the cArea variable:

         double cArea = ???????????????????;

    cout << "The area of the circle with radius 9 is: " << cArea << endl;

• What is output by the following program? (Do not run the code -- work it out by hand)

#include <iostream>
using namespace std;

int mystery(int param) {
    cout << "param=" << param << endl;
    param = param * 2;
    return param;
}

int main() {
    int num = 2;

    cout << "At first, num=" << num << endl;
    int result = mystery(num);
    cout << "After calling, num=" << num << endl;
    cout << "And result=" << result << endl;

    return 0;
}

1. At first, num=2
   param=2
   After calling, num=4
   And result=4
   

2. At first, num=2
   param=4
   After calling, num=4
   And result=4
   

3. At first, num=2
   param=2
   After calling, num=2
   And result=4
   

4. None of these

• Write the following functions:

• areaRectangle
• Takes in a double for the length and width
• returns the area of the rectangle as a double
  
• areaTriangle
• Takes in a double for the base and height
• returns the area of the triangle as a double
  
• mpg
• takes in an integer for the miles and the gallons
• returns the miles per gallon as a double