# Demonstrates the mathematical operators. : Primitive Data Type « Data Type « Java

Demonstrates the mathematical operators.

```
//: c03:MathOps.java
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002

import java.util.*;

public class MathOps {

// Shorthand to print a string and an int:

static void printInt(String s, int i) {

System.out.println(s + " = " + i);

}

// Shorthand to print a string and a float:

static void printFloat(String s, float f) {

System.out.println(s + " = " + f);

}
public static void main(String[] args) {
// Create a random number generator,
// seeds with current time by default:

Random rand = new Random();

int i, j, k;

// Choose value from 1 to 100:

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);

}

} ///:~

```

### Related examples in the same category

 1 Use Integer constructor to convert int primitive type to Integer object. 2 Convert Java Integer object to Numeric primitive types 3 Convert Java String to Integer object 4 Create an Integer object 5 Arithmetic Demo 6 Max Variable Length Demo 7 Data Type Print Test 8 Tests all the operators on all the primitive data types 9 Demonstrates the ++ and -- operators 10 Literals 11 Java lets you overflow 12 Built in types 13 Shows default initial values 14 Relational Demo 15 Parse Number 16 Java Type Helper 17 Convert the given array (which may be a primitive array) to an object array 18 Convert primitive back and forth 19 Returns a default value if the object passed is null 20 A mutable boolean wrapper. 21 A mutable byte wrapper. 22 A mutable double wrapper. 23 A mutable float wrapper. 24 A mutable int wrapper. 25 A mutable long wrapper. 26 A mutable short wrapper. 27 Primitive utilities