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使用工具：

Dev-C++ 5.11

题目描述：

编写一系统，计算常见图形（圆、三角形、正方形和矩形）的面积。

要求:

1. 实用性强（不懂计算机编程的人也能够使用）。
2. 用户根据自己需要选择某类图形、输入相应的数据后，能够正确的计算该图形的面积。
3. 能够重复执行上面的操作。
4. 当用户把所有图形面积计算完后，能够正常退出
5. 当用户数据输错时，能够有相应的错误提示。

参考代码：

#include<stdio.h>
int main()
{
	void menu(int n);
	int tf=1;
	menu(tf);
	
}
//主函数
void menu(int n)
{
	void cir(float n);
	void squ(float n);
	void rec(float n,float n1);
	void tri(float n,float n1);
	int choice;
	float bj,length,width,bc,bottom,height;

	while (n==1)
	{
		printf("\t--------------Computer shape area！------------\n");
		printf("\t1:computer circle area\n");
		printf("\t2:computer square area\n");
		printf("\t3:computer rectangle area\n");
		printf("\t4:computer triangle area\n");
		printf("\t0:quit the system\n");
		printf("\tInput select 1~4 computer shape area(0:quit system):");
		scanf("%d",&choice);
		printf("\n");
		if(choice==1)
		{
			printf("\tPlease enter the radius of the circle: ");
		    scanf("%f",&bj);
			printf("\tThe circle area:");
			cir(bj);
		}
		else if(choice==2)
		{
			printf("\tPlease enter the side length of the square:");
			scanf("%f",&bc);
			printf("\tThe square area:");
			squ(bc);
		}
		else if(choice==3)
		{
			printf("\tPlease enter the length and width of the rectangle:\n");
			printf("\tInput width of rectangle:");
			scanf("%f",&width);
			printf("\tInput length of rectangle:");
			scanf("%f",&length);
			printf("\tThe rectangle area:");
			rec(length,width);
		}
		else if(choice==4)
		{
			printf("\tPlease enter the bottom and height of the triangle:\n");
			printf("\tInput bottom of triangle:");
			scanf("%f",&bottom);
			printf("\tInput height of triangle:");
			scanf("%f",&height);
			printf("\tThe triangle area:");
			tri(bottom,height);
		}
		else if(choice==0)
		{
			printf("\t\tWelcome to use again, bye~~");
			break;
		}
		else
		printf("\tSorry, the number you entered is incorrect. Please press the menu to enter the number\n");
		
	}
 } 
//圆面积 
void cir(float n)
{
		float pai=3.14,area;
		area=n*n*pai;
	    printf("%.2f\n",area);
}
//正方形面积 
void squ(float n)
{
		float area;
		area=n*n;
		printf("%.2f\n",area);
}
// 矩形面积 
void rec(float n,float n1)
{
	float area;
	area=n*n1;
	printf("%.2f\n",area);
}
//三角形面积 
void tri(float n,float n1)
{
	float area;
	area=(n*n1)/2;
	printf("%.2f\n",area);
	
}

运行结果：