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//Ex4_5.java
/*
三民國中張老師成績管理系統
*/
import java.util.*;
public class PM4_2{
static int course[][] = new int[50][7]; //
宣告無序陣列空間
//陣列欄位名稱
static String name[]={"學號","國文","英文","數學","理化","自然","平均"};
static int point; //
宣告游標變數
public static void main(String args[]) {
Scanner keyin = new Scanner(System.in);
Random ran = new Random();
int value; //
輸入元素
int select; //
功能選擇
point = -1; //
游標初值(初值已存入
5
筆資料)
int location;
for (int i=0; i<10; i++){ //給予陣列初值
course[i][0] = 1 + ran.nextInt(50);
for(int j=1; j<=5; j++)
course[i][j] = 30 + ran.nextInt(70);
point = point + 1;
}
disp_menu();
select = keyin.nextInt();
while(select != 7) {
switch(select) {
case 1:
disp_course();
break;
case 2:
if (point >=50) {
System.out.printf("陣列已滿無法插入!!\n");
}else {
point = point +1;
System.out.printf("請輸入學生學號(2位數)
=>");
course[point][0]= keyin.nextInt();
System.out.printf("請輸入國文成績
=>");
course[point][1]= keyin.nextInt();
System.out.printf("請輸入英文成績
=>");
course[point][2]= keyin.nextInt();
System.out.printf("請輸入數學成績
=>");
course[point][3]= keyin.nextInt();
System.out.printf("請輸入理化成績
=>");
course[point][4]= keyin.nextInt();
System.out.printf("請輸入自然成績
=>");
course[point][5]= keyin.nextInt();
}
System.out.printf("目前學生人數為
%d\n", point);
break;
case 3:
System.out.printf("請輸入欲刪除學生學號
=>");
value = keyin.nextInt();
location = Linear_serach(value);
if (location == -1){
System.out.printf("沒有學號=
%d
學生\n",
value);
}else {
for(int i = location;i<=point;i++)
course[i] = course[i+1];
}
point = point - 1;
System.out.printf("%d
學生已刪除成功\n",
value);
System.out.printf("目前學生人數為
%d\n", point);
break;
case 4:
System.out.printf("請輸入欲查詢學號
=>");
value = keyin.nextInt();
location = Line_serach(value);
if (location == -1){
System.out.printf("沒有學號=
%d
學生\n",
value);
}else {
for(int i=0;i<=6;i++){
System.out.printf("%s=%d ", name[i], course[location][i]);
}
System.out.printf("\n");
}
break;
case 5:
System.out.printf("請輸入欲更新成績的學號
=>");
value = keyin.nextInt();
location = Line_serach(value);
if (location == -1){
System.out.printf("沒有學號=
%d
學生\n",
value);
}
else {
System.out.printf("更新
%d
學生的成績
=>\n", course[location][0]);
System.out.printf("請更新國文成績(%d)
=>", course[location][1]);
course[location][1]= keyin.nextInt();
System.out.printf("請更新英文成績(%d)
=>", course[location][2]);
course[location][2]= keyin.nextInt();
System.out.printf("請更新數學成績(%d)
=>", course[location][3]);
course[location][3]= keyin.nextInt();
System.out.printf("請更新理化成績(%d)
=>", course[location][4]);
course[location][4]= keyin.nextInt();
System.out.printf("請更新自然成績(%d)
=>", course[location][5]);
course[location][5]= keyin.nextInt();
}
break;
case 6:
int sum;
for(int i=0; i<=point; i++){
sum = 0;
for(int j=1; j<=5; j++)
sum = sum + course[i][j];
course[i][6] = sum/5;
}
buffer_sort();
disp_course();
break;
default:
System.out.printf("輸入錯誤
!!
請重新輸入\n");
}
disp_menu();
select = keyin.nextInt();
}
}
static void disp_menu() {
System.out.printf("==
三民國中
張老師成績管理系統
==\n");
System.out.printf("(1)
列印全班成績\n");
System.out.printf("(2)
新增學生成績\n");
System.out.printf("(3)
刪除學生成績\n");
System.out.printf("(4)
查詢學生成績\n");
System.out.printf("(5)
更新學生成績\n");
System.out.printf("(6)
依平均成績高低列印\n");
System.out.printf("(7)
離開系統\n");
System.out.printf("\t
請輸入工作選項
=>");
}
static void disp_course() { /*
列印全班各科成績
*/
System.out.printf("\n==
列印全班各科成績==\n");
for(int i=0; i<name.length; i++)
System.out.printf("%s ", name[i]);
System.out.printf("\n");
for(int i=0; i<=point; i++) {
for(int j=0; j<course[i].length; j++)
System.out.printf("%2d ",
course[i][j]);
System.out.printf("\n");
}
System.out.printf("\n"); //
列印完畢,
換行
}
static int Linear_serach(int value){
int flag=0, i=0;
int location=-1;
while (i <= point) {
if(value == course[i][0]) {
flag = 1;
location = i;
break;
}
i = i+1;
}
if (flag == 1)
return location;
else
return -1;
}
static void buffer_sort(){
int temp[] = new int[7];
for(int i=0; i<=point; i++){
for(int j=0; j<=point; j++) {
if(course[i][6] < course[j][6]){
temp = course[i];
course[i] = course[j];
course[j] = temp;
}
}
}
}
} |
