Java Tutorial/Operators/Arithmetic Operators

Applying the modulus operator, %, to floating-point values

   <source lang="java">

public class MainClass{

 public static void main(String[] arg){
    double a = 2.4;
    double b = 0.2;
    
         
    System.out.println( a % b );
 }

}</source>

0.1999999999999998

Arithmetic Calculations

An assignment statement has three elements:

1. the variable to store the result,
2. the assignment operator: =,
3. an arithmetic expression

The statement is terminated by a semicolon.

   <source lang="java">

public class MainClass{

 public static void main(String[] argv){
    int a = 1;
    int b = 2;
    int c = 0;
    
    c = a + b;
    
    System.out.println(c);
 }

}</source>

3

Arithmetic Operators

OperatorResult+Addition-Subtraction (also unary minus)*Multiplication/Division%Modulus++Increment+=Addition assignment-=Subtraction assignment*=Multiplication assignment/=Division assignment%=Modulus assignment--Decrement

Demonstrates the mathematical operators

   <source lang="java">

import java.util.Random; public class MainClass {

 static void printInt(String s, int i) {
   System.out.println(s + " = " + i);
 }
 static void printFloat(String s, float f) {
   System.out.println(s + " = " + f);
 }
 public static void main(String[] args) {
   Random rand = new Random();
   int i, j, k;
   j = rand.nextInt(100) + 1;
   k = rand.nextInt(100) + 1;
   printInt("j", j);
   printInt("k", k);
   i = j + k;
   printInt("j + k", i);
   i = j - k;
   printInt("j - k", i);
   i = k / j;
   printInt("k / j", i);
   i = k * j;
   printInt("k * j", i);
   i = k % j;
   printInt("k % j", i);
   j %= k;
   printInt("j %= k", j);
   // Floating-point number tests:
   float u, v, w; // applies to doubles, too
   v = rand.nextFloat();
   w = rand.nextFloat();
   printFloat("v", v);
   printFloat("w", w);
   u = v + w;
   printFloat("v + w", u);
   u = v - w;
   printFloat("v - w", u);
   u = v * w;
   printFloat("v * w", u);
   u = v / w;
   printFloat("v / w", u);
   // the following also works for
   // char, byte, short, int, long,
   // and double:
   u += v;
   printFloat("u += v", u);
   u -= v;
   printFloat("u -= v", u);
   u *= v;
   printFloat("u *= v", u);
   u /= v;
   printFloat("u /= v", u);
 }

}</source>

j = 31
k = 84
j + k = 115
j - k = -53
k / j = 2
k * j = 2604
k % j = 22
j %= k = 31
v = 0.79780066
w = 0.9309381
v + w = 1.7287388
v - w = -0.13313746
v * w = 0.7427031
v / w = 0.8569857
u += v = 1.6547863
u -= v = 0.8569857
u *= v = 0.6837037
u /= v = 0.8569856

Modulus operator %: obtain the remainder after a division

   <source lang="java">

public class MainClass {

 public static void main(String[] argv) {
   int a = 3 % 2;
   int b = 11 % 3;
   int c = 7 % -3;
   System.out.println(a);
   System.out.println(b);
   System.out.println(c);
 }

}</source>

1
2
1

The Basic Arithmetic Operators

   <source lang="java">

public class MainClass {

 public static void main(String args[]) {
   // arithmetic using integers
   System.out.println("Integer Arithmetic");
   int a = 1 + 1;
   int b = a * 3;
   int c = b / 4;
   int d = c - a;
   int e = -d;
   System.out.println("a = " + a);
   System.out.println("b = " + b);
   System.out.println("c = " + c);
   System.out.println("d = " + d);
   System.out.println("e = " + e);
  
   // arithmetic using doubles
   System.out.println("\nFloating Point Arithmetic");
   double da = 1 + 1;
   double db = da * 3;
   double dc = db / 4;
   double dd = dc - a;
   double de = -dd;
   System.out.println("da = " + da);
   System.out.println("db = " + db);
   System.out.println("dc = " + dc);
   System.out.println("dd = " + dd);
   System.out.println("de = " + de);
 }

}</source>

Integer Arithmetic
a = 2
b = 6
c = 1
d = -1
e = 1
Floating Point Arithmetic
da = 2.0
db = 6.0
dc = 1.5
dd = -0.5
de = 0.5