package bao01;
import java.util.Scanner;
public class Lei01 {
public static void main(String[] args)
{
//4.输入三个数,判断能否构成三角形(任意两边之和大于第三边)
Scanner input=new Scanner(System.in);
System.out.println("请输入a的值");
double a=input.nextDouble();
System.out.println("请输入b的值");
double b=input.nextDouble();
System.out.println("请输入c的值");
double c=input.nextDouble();
if((a<=0)||(b<=0)||(c<=0)) {
System.out.println("输入不合法");
}else if((a+b)>c&&(a+c)>b&&(b+c)>a) {
System.out.println("可以构成三角形");
}else
System.out.println("不可以构成三角形");
}
}
package bao01;
import java.util.Scanner;
public class Lei01 {
public static void main(String[] args)
{
/*2.输入一个4位会员卡号,如果百位数字是3的倍数,就输出是幸运会员,否则就输出不是.
* 3.已知函数,输入x的值,输出对应的y的值.
x + 3 ( x > 0 )
y = 0 ( x = 0 )
x2 –1 ( x < 0 )
*/
Scanner input=new Scanner(System.in);
System.out.println("请输入x的值");
double x=input.nextDouble();
if(x>0) {
System.out.println("y="+(x+3));
}else if(x==0) {
System.out.println("y=0");
}else
System.out.println("y="+(x*x+1));
}
}
package bao01;
import java.util.Scanner;
public class Lei01 {
public static void main(String[] args)
{
//2.输入一个4位会员卡号,如果百位数字是3的倍数,就输出是幸运会员,否则就输出不是.
Scanner input=new Scanner(System.in);
System.out.println("请输入4位数卡号");
int card=input.nextInt();
if((card<0)||card>9999) {
System.out.println("输入卡号不合法");
}else if((card/100%10)%3==0) {
System.out.println("是幸运会员");
}else
System.out.println("不是幸运会员");
}
}