area.c

北大青鸟软件工程师ppt的学生用书源代码

#include <stdio.h>
#define PI 3.14
void main()
{
	float radius, length, breadth, height, base;
	double area;
    int choice; 
	printf("\n\t形状的类型\n");
	printf("\n\t1. 长方形\n");
	printf("\t2. 圆形\n");
	printf("\t3. 三角形\n");
	printf("\t4. 退出\n");

	printf("\n\t请输入选项(1/2/3/4): ");
	scanf("%d", &choice);

	switch (choice)
	{
		case 1: printf("\n 请输入长方形的详细信息");
				printf("\n 长为 :");
				scanf("%f",&length);
				printf("\n 宽为 :");
				scanf("%f",&breadth);
				area = length * breadth;
				printf("\n 该长方形的面积为 %7.2f\n", area);
				break;

		case 2: printf("\n 请输入圆形的详细信息");
				printf("\n 半径为 :");
				scanf("%f",&radius);
				area = PI * radius * radius;
				printf("\n 该圆形的面积为 %7.2f\n", area);
				break;

		case 3: printf("\n 请输入三角形的详细信息");
				printf("\n 高为 :");
				scanf("%f",&height);
				printf("\n 底边为 :");
				scanf("%f",&base);
				area = 0.5 * height * base;
				printf("\n 该三角形的面积为 %7.2f\n", area);
				break;

		case 4: printf("\n 退出程序\n");
				break;

		default: printf("\n 选项错误\n");
	}
}