C++ round a double up to 2 decimal places

I am having trouble rounding a GPA double to 2 decimal places. (ex of a GPA needed to be rounded: 3.67924) I am currently using ceil to round up, but it currently outputs it as a whole number (368)

here is what I have right now

if (cin >> gpa) {
    if (gpa >= 0 && gpa <= 5) {
           // valid number

           gpa = ceil(gpa * 100);

           break;
    } else {
           cout << "Please enter a valid GPA (0.00 - 5.00)" << endl;
           cout << "GPA: ";

    }
}

using the above code with 3.67924 would output 368 (which is what I want, but just without the period between the whole number and the decimals). How can I fix this?

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