- 編寫程序,設計一個圖平面積計算,選擇不同的圖形輸入數字計算面積,選擇4退出程序。效果如下:
import java.util.Scanner;
public class Test5 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int num;
do {
System.out.println("計算面積");
System.out.println("1.矩形 2.三角形 3.圓 4.退出");
System.out.println("請選擇數字對應的功能:");
num = sc.nextInt();
if (num == 1) {
System.out.println("你選擇了矩形");
System.out.println("請輸入矩形的長:");
double len = sc.nextDouble();
System.out.println("請輸入矩形的寬:");
double wid = sc.nextDouble();
System.out.println("矩形的面積爲"+(len*wid));
} else if (num ==2) {
System.out.println("你選擇了三角形");
System.out.println("請輸入三角形的底:");
double floor = sc.nextDouble();
System.out.println("請輸入三角形的高:");
double high = sc.nextDouble();
System.out.println("三角形的面積爲"+(floor * high/2));
}else if (num == 3) {
System.out.println("你選擇了圓");
System.out.println("請輸入三角形的半徑:");
double r = sc.nextDouble();
System.out.println("圓的面積爲"+(r*r*3.1415926));
}
} while (num!=4);
System.out.println("系統退出");
}
}
運行結果: