# Java 实例 计算三角面积

1）程序 1：提示用户输入三角形的基本宽度和高度。

2）程序 2：无用户交互：程序本身指定了宽度和高度。

/**
* @author: BeginnersBook.com
* @description: Program to Calculate area of Triangle in Java
* with user interaction. Program will prompt user to enter the
* base width and height of the triangle.
*/
import java.util.Scanner;
class AreaTriangleDemo {
public static void main(String args[]) {
Scanner scanner = new Scanner(System.in);

System.out.println("Enter the width of the Triangle:");
double base = scanner.nextDouble();

System.out.println("Enter the height of the Triangle:");
double height = scanner.nextDouble();

//Area = (width*height)/2
double area = (base* height)/2;
System.out.println("Area of Triangle is: " + area);
}
}


Enter the width of the Triangle:
2
Enter the height of the Triangle:
2
Area of Triangle is: 2.0


/**
* @author: BeginnersBook.com
* @description: Program to Calculate area of Triangle
* with no user interaction.
*/
class AreaTriangleDemo2 {
public static void main(String args[]) {
double base = 20.0;
double height = 110.5;
double area = (base* height)/2;
System.out.println("Area of Triangle is: " + area);
}
}


Area of Triangle is: 1105.0


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