已知三角形的三边，求其面积

#include <stdio.h>
#include <math.h>
int main()
{
    float a, b, c, p, area;
    printf("Please enter the three sides of a triangle: a= ,b= ,c= \n");
    scanf("a=%f,b=%f,c=%f", &a, &b, &c);
    p = (a + b + c)/2;
    area = sqrt(p * (p - a) * (p - b) * (p - c));
    printf("The area of the triangle is: %.2f\n", area);
    return 0;
}