C语言程序设计题

我用海伦公式写的 #include #include bool is_triangle(double a,double b,double c) { if(a+b<=c || a+c<=b || b+c<=a) return false; return true; } double SABC(double a,double b,double c) { double p; p=(a+b+c)/2.0; return sqrt(p*(p-