How to use setprecision in C++

I am new in C++ , i just want to output my point number up to 2 digits. just like if number is 3.444, then the output should be 3.44 or if number is 99999.4234 then output should be 99999.42, How can i do that. the value is dynamic. Here is my code.

#include <iomanip.h>
#include <iomanip>
int main()
{
    double num1 = 3.12345678;
    cout << fixed << showpoint;
    cout << setprecision(2);
    cout << num1 << endl;
}

but its giving me an error, undefined fixed symbol.