AP Computer Science Lesson Introductory Java Language Features (5)

Hey Steemers! Here's another Java lesson! Learn much!!!

---

Bell Work (No Quiz Today Steemers, but answer this and you'll get an upvote!):

Analyze what the following code prints:

public class WhatDoIDo {
public static void main(String[] args) {
int i;
int n = 5;
int number1 = 1;
int number2 = 1;
int number 3 = 1;
System.out.print(number1);
System.out.print(number2);
for (i = 1; i = n; i++) {
number3 = number1 + number2;
System.out.print(number3);
number1 = number2;
number2 = number3;
}
}
}

---

Classwork:

Use the mod (or remainder) operation, %, to ask the user what power of i they want.

Have the program ask the user for the exponent, say i^3451. Your program will find the remainder of the exponent (with respect to 4) and will use the remainder to print strings with the following answers “i”, “-1”, “-i”, “1”. Do this with an if statement.

• Remember that // is a comment, so the computer does not read it. I will use these to describe what the code is doing. For your learning!

import java.util.Scanner;
public class PowerOfI {
public static void main(String[] args) {

// We need to first ask the user what power of i they want.
System.out.println("What power of i would you like? Please type an integer.");
Scanner input = new Scanner(System.in);
int value = input.nextInt();

// Now, we do the math. % means remainder, so 25%4 would be 1 for example.
int newValue = value % 4;

// Finally, the if statement.
if (newValue == 1) {
System.out.println("The value of i to the power of " + value + " is i.") }
if (newValue == 2) {
System.out.println("The value of i to the power of " + value + " is -1.") }
if (newValue == 3) {
System.out.println("The value of i to the power of " + value + " is -i.") }
if (newValue == 0) {
System.out.println("The value of i to the power of " + value + " is 1.") }
}
}

Example of the display

If the user said "45", so they wanted i^45, the program would show:

What power of i would you like? Please type an integer.
45
The value of i to the power of 45 is i.

---

Hope you've learned something Steemers! Learning a new language takes practice. Study hard! Any questions,
just ask! I am your teacher!