ex2_3.cpp

纯粹是学习专用～

#include<stdio.h>
#include<math.h> 
void main() {
	float a,b,c;
	float s,area;
	printf("Input three sides a,b,c:\n");
	scanf("%f%f%f",&a,&b,&c);
	s=(a+b+c)/2;
	area=sqrt(s*(s-a)*(s-b)*(s-c));
	printf("a=%10.2f,  b=%10.2f,  c=%10.2f\n",a,b,c);
	printf("s=%10.2f,  area=%10.2f\n",s,area);
}