例3.1
package fengda;
public class fengda01 {
public static void main(String args[]) {
int score=65;
if(score>=60)
System.out.println("考试及格了!");
else
System.out.println("考试不及格，需要补考!");
}
}
例3.2
package fengda;
import java.io.*;
public class fengda02 {
public static void main(String arg[])throws IOException{
int x;
double y;
String str;
BufferedReader buf;
System.out.print("请输入一个数:");
buf=new BufferedReader(new InputStreamReader(System.in));
str=buf.readLine();
x=Integer.parseInt(str);
if(x>=0)
{
y=Math.sqrt(x);
System.out.println(x+"的平方根为:"+y);
}
else
System.out.println("输入错误!");
}
}
例3.3
package fengda;
import java.io.*;
public class fengda03 {
public static void main(String arg[]) throws IOException{
int x;
String str;
BufferedReader buf;
System.out.print("请输入学生成绩(0-100)之间:");
buf=new BufferedReader(new InputStreamReader(System.in));
str=buf.readLine();
x=Integer.parseInt(str);
if(x>=85)
System.out.println("成绩优秀!");
else if(x>=75)
System.out.println("成绩良好!");
else if(x>=60)
System.out.println("成绩及格!");
else
System.out.println("成绩不合格!");
}
}
例3.5
package fengda;
public class fengda04 {
public static void main(String args[])
{
int x=2,y=1;
switch(x+y)
{
case 1:
System.out.println(x+y);
break;
case 3:
System.out.println(x+y);
case 0:
System.out.println(x+y);
break;
default:System.out.println("没有般配的"+(x+y));
}
}
}
