Activity #17 - One-Dimensional Array

Place all codes under the method main.

1. Input 5 numbers and satisfy the ff:
    a) sum of all input numbers
    b) count of odd and even numbers except zero
    c) count of positive, negative, and zeroes
    d) count of divisible by 5

2. Generate 20 random numbers from 50-100 only and determine the ff:
    a) the number of times 100 occurs
    b) what are the lowest and highest generated numbers

3. Convert #1  to methods:
     methods: main - calls method series
                     series - declares the array and its size
                               - calls the different methods below
                     input - input 5 numbers
                     output - display the array elements
                     sum - compute and display the sum
                     oddeven - count the odd and even numbers, display the results
                     posnegzero - count the positive, negative, and zeroes, display the results
                     div5 - count the numbers that are divisible by 5, display the result
 
4. Convert #2 to methods:
    methods: main - calls method randomnumbers
                    randomnumbers - declares the array and its size
                                               - call the methods below:
                    fill - populate the array with random numbers
                    display  - display the array elements
                    t100 - counts the number of times 100 occurs, display the result
                    highlow - determines the lowest and highest numbers (the 1st element of the array is regarded as the lowest and the highest value from the start), display the results
         

Activity #16 - Random Number, Method, Recursion

int n1 = (int) (Math.random() * 3);  //generates numbers 0-2 only

int n2 = (int) (Math.random() * 3+1);   //generates numbers 1-3 only


GUESSING GAME
#1 Guess the random number from 1-3 only.
methods:
main - calls method guess
guess - generates a random number
          - accepts user's input
          - determines if the user's guess is 'correct' or 'not correct'
          - ask the user to Try Again (recursion)
input - validates user's input (1-3 only) (apply recursion)

solution:
public static void main(String args[])
{ guess( );
}

static void guess( )
{  System.out.println("Input 1-3 only");
    int u = input( );
    int r = (int) (Math.random() * 3+1);
    System.out.println("Random number is "+r);
    if (u == r)
       System.out.println("Correct");
       else
        System.out.println("Not Correct");

    System.out.println("Try Again? Press 'Y' to continue.");
    char ch = sc.next( ).toUpperCase( ).charAt(0);
    if (ch == 'Y')
        guess( );
        else
        return;
}

static int input( )
{  int u = sc.nextInt( );
    if (u<1 || u>3)
        input( );
        else
        return u;
}





#2 Scoring the guessing game
methods:
main - calls method guess
guess - generates a random number
          - accepts user's input
          - determines if the user's guess is 'correct' or 'not correct', update the score if 'correct'
          - ask the user to Try Again (apply recursion),
          - before exit, display the total score/the number of tries
input - validates user's input (1-3 only) (apply recursion for invalid input)

HIGH/LOW

methods: 

main - calls method highlow
guess - generates a random number from 0-10 only
          - accepts user's input
          - determines if the user's guess is 'correct' or 'not correct', update the score if 'correct'
          - ask the user to Try Again (apply recursion),
          - before exit, display the total score/the number of tries
input - validates user's input (0-1 only, 0 means below 6, 1 means above 5 ) (apply recursion for invalid input)

Recursion - Activity #15

input: Employee name, employee code, days worked

output: Employee name, gross pay, total deduction, net pay

where: gross pay = days worked * rate
            total deduction = sss + tax
            sss = 10% of gross pay
            tax = 15% of gross pay
            net pay = gross pay - total deduction

rate table:   employee code       rate
                            1                    530
                            2                    550
                            3                    570

methods:
main - calls employee method
employee - performs the input requirements, calls salary method, performs recursion for Try Again
salary - performs all computations, calls method output
output - displays the required outputs
code - validates the input code (1-3 only)
days - validates the input days worked (0-12 only)

Recursion - Activity 14

Area Menu
C. Circle
R. Rectangle
S. Square
T. Triangle
X. eXit
Select CRSTX only

methods:
main - calls area method
area - displays the selection, accepts CRSTX input, impelements recursion
circle - calls method input for the radius, compute and display the area of the circle
rectangle - calls method input for the length and width, compute and display the area of the rectangle
square - calls method input for the side, compute and display the area of the square
triangle - calls method input for the base and height, compute and display the area of the triangle
input - validates the input value of radius, length, width, side, base, and height where the allowed value is any positive number, implements recursion for invalid value