Admin: 1 версия

2010-06-01T04:57:55Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

Новая страница

== 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>



<pre class=codeResult>0.1999999999999998</pre>

== Arithmetic Calculations ==

<p>An assignment statement has three elements:</p>
<OL><LI>the variable to store the result,</LI><LI>the assignment operator: =,</LI><LI>an arithmetic expression</LI></OL>
<p>The statement is terminated by a semicolon.</p>



<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>



<pre class=codeResult>3</pre>

== 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>



<pre class=codeResult>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</pre>

== 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>



<pre class=codeResult>1
2
1</pre>

== 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>



<pre class=codeResult>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</pre>

← Предыдущая	Версия 04:57, 1 июня 2010
(нет различий)

Java Tutorial/Operators/Arithmetic Operators - История изменений

Admin: 1 версия

в 17:44, 31 мая 2010