Review Activity

Write the Javadoc comment for the below method:

public static double calc_area_circle(int radius) {

    double area = 3.14 * radius * radius;

    return area;

}

Call the above method, passing in 9 as the radius:

double area = ???????????????????????;

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

public static int mystery(int param) {
        System.out.println("param=" + param);
        param = param * 2;
        return param;
}

public static void main(String[] args) {
    int num = 2;
    System.out.println("At first, num=" + num);
    int result = mystery(num);
    System.out.println("After calling, num=" + num);
    System.out.println("And result=" + result);
}

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 methods:

• calcTip
• Takes in one double parameter for the price of a meal
• Calculates 15 percent of the price as the tip
  
• returns a double for the tip
  
• calcGPA
  
• takes in one double parameter for the grade points and one integer parameter for the number of units.
• divides the grade points by the units to calculate the GPA
  
• returns a double for the GPA
• minNum
  
• Takes in two integer parameters
  
• determines which of the two numbers is smaller
• returns the smaller number