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Thanks for the help guys

If i would ask to print S() it would print 0

Well it should fail 2nd test and print triangle does not exist but i also rewrote the code. Now it checks if the triangle is real at the end and prints the answer based on that

s=(a, b , c); i just forgot the 2nd S

void duom(double &a, double &b, double &c)
{
ifstream in("sk.txt");
in >> a;
in >> b;
in >> c;
in.close();
}