i = 1;
j = i + 1;
System.out.println("i="+i);
System.out.println("j="+j);
//System.out.println("j="+(j=i+j));
//System.out.println("j="+j);
int a, b, c;
long l=3;
a = 1;
b = 2;
c = l + 1; //将出错!
c = (int)(l + 1);
System.out.println("a=" + a + "\tb=" + b+"\tc=" + c);
System.out.println(a=b=3+4);
System.out.println("a=" + a + "\tb=" + b+"\tc=" + c);
//System.out.println(a=1+(b=2+(c=3+4)));
//System.out.println("a=" + a + "\tb=" + b+"\tc=" + c);
byte b1=42;
System.out.println("b1="+b1+"\t~b1="+~b1);
System.out.println("b1<<2 ="+(b1<<2));
System.out.println("b1>>2 ="+(b1>>2));
byte b2=-42;
System.out.println("b2>>2 ="+(b2>>2));
System.out.println("b2>>>2 ="+(b2>>>2)); //注意:结果取int类型
System.out.println("b1>>>2 ="+(b1>>>2));
byte b3=15;
System.out.println("b1&;b3 ="+(b1&;b3));
System.out.println("b1|b3 ="+(b1|b3));
System.out.println("b1^b3 ="+(b1^b3));
int x1=1,y1;
y1=++x1;
System.out.println("y1="+y1+"\tx1="+x1);
int x2=1,y2;
y2=x2++;
System.out.println("y2="+y2+"\tx2="+x2);
int n=1,m=2,max;
System.out.println("max="+(max=n>m?n:m));
System.out.println(" '6'-48="+('6'-48));
System.out.println(" '6'^48="+('6'^48));
System.out.println(" '6'&;~48="+('6'&;~48));
double xx = 2.0, yy = 3.0, z;
System.out.println("xx="+xx+"\tyy=+yy);
System.out.println("xx-yy的绝对值是:" + Math.abs(xx - yy));
System.out.println("xx的yy次方是:" + Math.pow(xx, yy));
z = Math.sqrt(yy);
System.out.println("yy的平方根是:" + z);
System.out.println("第一次产生的随机数是:" + Math.random());
System.out.println("第二次产生的随机数是:" + Math.random());
}
}
##################################################################
//数值输入练习;
import java.io.*;
/**
* Summary description for Program
*/
public class Program1
{
public static void main(String[] args)throws java.io.IOException
{
BufferedReader din = new BufferedReader(new InputStreamReader
(System.in));
String input;
int i,ii;
float f,ff;
System.out.println("请输入一个整数:");
input = din.readLine();
i = Integer.valueOf(input).intValue();
ii=i*2;
System.out.println("请输入一个实数:");
input = din.readLine();
f = Float.valueOf(input).floatValue();
ff=f*2;
System.out.println("您输入的整数×2的值是:" + ii);
System.out.println("您输入的实数×2的值是:" + ff);
}
}
##############################################################################
//FahToCal.java
import java.io.*;
public class FahToCal
{
public static void main(String[] args)throws IOException
{
BufferedReader din = new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入一个华氏温度值:");
String input = din.readLine();
double fahrenheit= Double.valueOf(input).doubleValue();
double celsius=(fahrenheit -32.0)*5.0/9.0;
System.out.println("celsius="+ celsius);
}
}
##########