#include<stdio.h>
#include<math.h>
double length(double a,double b)//矩形面积模块
{
double acreage;
acreage=a*b;
return acreage;
}
double lengt(double a,double b,double c)
{
double acreag;
double p;
p=1/2*(a+b+c);
acreag=sqrt(p*(p-a)*(p-b)*(p-c));
return acreag;
}
int main()
{
double a,b,c,form,acreage,acreag;
printf("请选择图形(1:为矩形 2:为三角形 )\n");
scanf("%d",&form);
if(form==1)
{
printf("请输入矩形边长:\n");
scanf("%d%d",&a,&b);
acreage=length(a,b);
printf("这个矩形的面积是:%d\n",acreage);
}
if(form==2)
{
printf("请输入三角形边长:\n");
scanf("%d%d%d",&a,&b,&c);
acreag=lengt(a,b,c);
printf("这个三角形的面积是:%d\n",acreag);
}
return 0;
}