顺序结构程序设计

计算一个三角形面积，已知边长为a,b,c,s=根号下（s-a）*（s-b）*（s-c）*s，求面积

#define _CRT_SECURE_NO_WARNINGS 1
#include
#include 
int main()
{
	float a, b, c, s, area;
	scanf("%f,%f,%f,", &a, &b, &c);
	s = 1.0 / 2*(a+ b + c);
	area = sqrt(s * (s - a) * (s - b) * (s - c));
	printf("a=%7.2f,b=%7.2f,c=%7.2fn", a, b, c, s);
	printf("area=%7.2fn", area);

}