Java Tutorial/Operators/Arithmetic Operators

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

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

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.

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);
  }
}

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

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);
  }
}

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

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);
  }
}

1
2
1

The Basic Arithmetic Operators

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);
  }
}

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