#include "
stdio.h"
double mianji(double x,double y)
{
return x*y;
}
double zouchang(double x,double y)
{
return 2*(x+y);
}
int main()
{
double x,y;
printf("请输入矩形长和宽:");
scanf("%lf%lf",&x,&y);
printf("矩形面积:%lf\n",mianji(x,y));
printf("矩形周长:%lf\n",zouchang(x,y));
}