Advanced Arithmetic Operation

Math class (docs)

Math is a class that provides common mathematical operations:

Power and root
Logarithm
Max, Min
Trigonometry
Random
…

Program.java

public class Program {
    public static void main(String[] args) {
        double n = 5;
        double power = 4;
        double nPower = Math.pow(n, power);
        System.out.println(n + " to the " + power + "th power = " + nPower
        );
    }
}

Data Type: Integer and Double

Integer [+,-,*,/] Integer = Integer

double a = 3.75, b = 2.5; 
int p = 13, q = 4; 
System.out.println(p + q); 
System.out.println(p - q); 
System.out.println(p * q);
System.out.println(p / q); 

Double [+,-,*,/] Double = Double

double a = 3.75, b = 2.5;
int p = 13, q = 4;
System.out.println(a + b);
System.out.println(a - b);
System.out.println(a * b);
System.out.println(a / b);

Double [+,-,*,/] Integer = Double

double a = 3.75, b = 2.5;
int p = 13, q = 4;
System.out.println(a + p);
System.out.println(a - p);
System.out.println(a * p);
System.out.println(a / p);

Integer / Integer

System.out.println(1 / 2);     //  0
System.out.println(3 / 2);     //  1
System.out.println(14 / 3);    //  4
System.out.println(-1 / 2);    //  0
System.out.println(-3 / 2);    // -1
System.out.println(-14 / 3);   // -4

Integer → Double

double a = 3.75, b = 2.5;
int p = 13, q = 4;
double c = p / q;
double d = (double) p / q;
double e = (double) (p / q);
System.out.println(c);
System.out.println(d);
System.out.println(e);

Double → Integer

double a = 3.75, b = 2.5;
int p = 13, q = 4;
int r = a / b;
int s = (int) a / b;
int t = (int) (a / b);
System.out.println(r);
System.out.println(s);
System.out.println(t);

Input

String name = "Arif";
String message = "Welcome " + name + "!";

System.out.println(message);

import java.util.Scanner;
public class Program {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String name = input.nextLine();
        String message = "Welcome " + name + "!";

        System.out.println(message);
    }
}

Scanner input = new Scanner(System.in);
System.out.print("What is your name? ");
String name = input.nextLine();
String message = "Welcome " + name + "!";

System.out.println(message);

Basic Methods of Scanner

Reading Strings

nextLine()
next()

One line

Reading Numners

nextInt()
nextDouble()
nextLong()

Integer

Special Case

Scanner input = new Scanner(System.in);
System.out.print("What is your name? ");
String name = input.nextLine();
System.out.print("What is your age? ");
int age = input.nextInt();
System.out.println("Hello, " + name);
System.out.println("You are " + age + " years old");

Scanner input = new Scanner(System.in);
System.out.print("What is your age? ");
int age = input.nextInt(); // apa yang terjadi ketika nextInt digunakan sebelum NextLine?
System.out.print("What is your name? ");
String name = input.nextLine();
System.out.println("Hello, " + name);
System.out.println("You are " + age + " years old");

Scanner input = new Scanner(System.in);
System.out.print("What is your age? ");
int age = input.nextInt();
input.nextLine(); // tambahkan ini untuk mengatasi permasalahan nextInt sebelum nextLine
System.out.print("What is your name? ");
String name = input.nextLine();
System.out.println("Hello, " + name);
System.out.println("You are " + age + " years old");

Output Formatting

Too Many Trailing Digits!

double athird = 1.0 / 3;
System.out.println(athird);

//Output 0.3333333333333333 - Too Long

Try use this!

System.out.printf()

System.out.format()

System.out.printf(format, param1, param2, ...);

Example

double tax = 0.2 * price;
System.out.printf("Price: %.2f, Tax: %.2f", price, tax);

Format Works

Converters & Flags

Converters	Flag	Description
d		Integer
f		Float/Double
n		Newline
s		String
	+	Includes sign, whether positive or negative.
	,	Includes locale-specific grouping characters (thousands)
	-	Left-justified.
	8	Eight characters in width, right justified
	08	Eight characters in width, with leading zeroes as necessary.
	.3	Three places after decimal point.
	10.3	Ten characters in width, right justified, with three places after decimal point.

String name = "Ani";
int age = 6;
double saving = 1234567.89012345;

System.out.printf("Name: %s %n", name);
System.out.printf("Name: %10s %n", name);
System.out.printf("Name: %-10s %n", name);

System.out.printf("Age: %d years old %n", age);
System.out.printf("Age: %2d years old %n", age);
System.out.printf("Age: %02d years old %n", age);

System.out.printf("Saving: Rp %f %n", saving);
System.out.printf("Saving: Rp %.2f %n", saving);
System.out.printf("Saving: Rp %12.2f %n", saving);
System.out.printf("Saving: Rp %5.2f %n", saving);
System.out.printf("Saving: Rp %,.2f %n", saving);

Saving Formatted String in Variables

String.format(format, param1, param2, ...)

Example:

String priceString = String.format("Rp %.2f", price);

Persiapan Belajar

Materi

Task

Programming by Doing

Compiler

Advanced Arithmetic Operation, Input, Output Formatting

Advanced Arithmetic Operation

Math class (docs)

Data Type: Integer and Double

Input

Basic Methods of Scanner

Reading Strings

Reading Numners

Special Case

Output Formatting

Too Many Trailing Digits!

Try use this!

System.out.printf()

Format Works

Converters & Flags

Saving Formatted String in Variables

​Advanced Arithmetic Operation

​Math class (docs)

​Data Type: Integer and Double

​Input

​Basic Methods of Scanner

​Reading Strings

​Reading Numners

​Special Case

​Output Formatting

​Too Many Trailing Digits!

​Try use this!

​System.out.printf()

​Format Works

​Converters & Flags

​Saving Formatted String in Variables

Advanced Arithmetic Operation

Math class (docs)

Data Type: Integer and Double

Input

Basic Methods of Scanner

Reading Strings

Reading Numners

Special Case

Output Formatting

Too Many Trailing Digits!

Try use this!

System.out.printf()

Format Works

Converters & Flags

Saving Formatted String in Variables