非常的简单

#include <iostream>
#include <cmath>
using namespace std;
double s;
void gs(double a,double b,double c){
	double p = (a + b + c) / 2.0;
	double s = sqrt(p * (p - a) * (p - b) * (p - c));
    printf("%0.2f",s);
} 
int main(){
	double a,b,c;
	cin >> a >> b >>c;
	gs(a,b,c);
	
	return 0;
}

看完好用的点一个赞