public class Test2 {
/**
* @param args
*/
public static void main(String[] args) {
int r=5;
double s=3.14*r*r;
System.out.println("圆的面积为S="+s);
}
}
public class Test2 {
/**
* @param args
*/
public static void main(String[] args) {
double hua=50;
double shua=50-32;
shua=shua*5.0/9.0;
System.out.println(hua+"华氏度="+shua+"摄氏度");
double she=30;
double hshe=she*9.0/5.0+32;
System.out.println(she+"摄氏度="+hshe+"华氏度");
}
}
public class Test2 {
/**
* @param args
*/
public static void main(String[] args) {
int a=5;
int b=8;
int c;
System.out.println("a="+a+"\tb="+b);
c=a;
a=b;
b=c;
System.out.println("a="+a+"\tb="+b);
}
}
public class Test2 {
/**
* @param args
*/
public static void main(String[] args) {
int a=12345;
System.out.println("a="+a);
a=a/100*100;
System.out.println("a="+a);
}
}
public class Test2 {
/**
* @param args
*/
public static void main(String[] args) {
int a=456;
int ge=a%10;
int shi=a%100/10;
int bai=a%1000/100;
int sum=ge+shi+bai;
System.out.println(sum);
}
}
public class Test2 {
/**
* @param args
*/
public static void main(String[] args) {
char x='H';
char d='f';
System.out.println("x是"+x+"\t d是"+d);
x=(char)(x+32);
d=(char)(d-32);
System.out.println("x是"+x+"\t d是"+d);
}
}
