第二次考核
码云： https://gitee.com/gs717/codes
第一题 7.5
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int[] grade = new int[5];
for(int i=0; i<grade.length; i++){
grade[i] = in.nextInt();
}
RR rr = new RT(grade);
double dd = rr.mark();
System.out.printf("%.2f",dd);
}
}
abstract class RR{
int[] grade;
public RR(int[] grade){
this.grade = grade;
}
public abstract double mark();
}
class RT extends RR{
}
7.6 集体评分
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int[] grade = new int[5];
for(int i=0; i<grade.length; i++){
grade[i] = in.nextInt();
}
RR rr = new RT(grade);
double dd = rr.mark();
System.out.printf("%.2f",dd);
}
}
abstract class RR{
int[] grade;
public RR(int[] grade){
this.grade = grade;
}
public abstract double mark();
}
class RT extends RR{
}
7.7 程序填空
public class Main {
public static void main(String[] args) {
Son son = new Son();
son.method();
}
}
class Parent {
Parent() {
System.out.println("Parent's Constructor without parameter");
}
Parent(boolean b) {
System.out.println("Parent's Constructor with a boolean parameter");
}
public void method() {
System.out.println("Parent's method()");
}
}
class Son extends Parent {
Son() {
super(true); //调用父类有参构造 ()内true或false都可以
System.out.println("Son's Constructor without parameter");
}
public void method() {
System.out.println("Son's method()");
super.method();
}
}
7.8
两点距离：代码如下
package testprograme;
import java.util.Scanner;
public class xy {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String inputString = sc.nextLine();
String stringArray[] = inputString.split(" ");
int num[] = new int[stringArray.length];
for (int i = 0; i < stringArray.length; i++) {
num[i] = Integer.parseInt(stringArray[i]);
System.out.println(num[i]);
}
int xAll = Math.abs(num[0]) + Math.abs(num[2]);
int yAll = Math.abs(num[1]) + Math.abs(num[3]);
double lineLength = Math.pow(xAll,2) + Math.pow(yAll,2);
double cLength = Math.pow(lineLength, 1.0/2);
System.out.println(cLength);
}
}
利用个 数学公式求两点间距离因为是象限 输入值可能为负数所以运用了绝对值
a^+b^=c^ 输出c^后开放 即为所求结果
