十进制格式不起作用,但相信可以正确输入 区域计算不起作用继续给我0.0周长的工作。 当他们输入无效或选项时,我需要帮助让它跳过输入半径。请帮忙。随附的是该计划:
import java.text.DecimalFormat;
import java.util.Scanner;``
public class Calculator {
public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
DecimalFormat formatter = new DecimalFormat("#00.0000");
String choice;
int option;
double area;
double circumference;
double radius;
area = 0;
circumference = 0;
option = keyboard.nextInt();
radius = keyboard.nextDouble();
System.out.println("CIRCLE CALCULATOR MENU");
System.out.println("1) Calculate the Area of a Circle");
if (option == 1) {
area = (radius*radius)*Math.PI;
}
System.out.println("2) Calculate the Circumference of a Circle");
if (option == 2) {
circumference = 2*radius*Math.PI;
}
System.out.println("3) Quit the Program");
System.out.println("");
System.out.println("Make a selection by choosing a number: ");
if (1 == option || 2 == option)
System.out.println("Please enter the radius of the circle: ");
if (1 == option) {
System.out.println("The area of the circle with radius "+radius+" is: " + circumference + "");
}else if (2 == option) {
System.out.println("The circumference of the circle with radius "+radius+" is: " + circumference + "");
} else if (option == 3) {
System.out.println("You have chosen to quit the program");
} else if (option > 4) {
System.out.println("You have made an invalid selection.");
}
}
}
答案 0 :(得分:1)
当您确实要打印区域值时,您正在打印周长值:
System.out.println("The area of the circle with radius " + radius + " is: " + circumference + "");
在上述声明中将circumference
更改为area
将解决问题。
答案 1 :(得分:0)
您已重新排列代码。它的顺序不正确:
试试这个:
while(true) {
Scanner sc = new Scanner(System.in);
System.out.print("Please enter your option 1.Area 2.Circumference 3.Quit");
int choice = sc.nextInt();
double area = 0,circumference =0, radius=0;
switch (choice) {
case 1:
System.out.print("PLease enter the radius :");
radius = sc.nextInt();
area =(radius*radius)*Math.PI;
System.out.print("Area : " +area);
continue;
case 2:
System.out.print("PLease enter the radius :");
radius = sc.nextInt();
circumference = 2*radius*Math.PI;
System.out.print("circumference : " +circumference);
continue;
case 3:
break;
default:
System.out.print("Enter a valid option");
}
}