为什么这个程序直接判断为else的情况，我输入3，4，5不满足吗。求大佬指教

Question

#include
#include
int main()
{
double a, b, c, s, area;
scanf_s("a,b,c", &a, &b, &c);
s = (a + b + c) / 2;
area = sqrt(s*(s - a)*(s - b)*(s - c));
if (a + b > c&&a + c > b&&b + c > a)
printf("%lf", area);
else
return 0;
}

Answer 1

scanf_s("a,b,c", &a, &b, &c);用错了

用%lf