Need help formatting output C++

Question

My function to display a division table is working, but I want to format the output to allow any number of character preceding the decimal, but limiting the after decimal places to 2. Here is the code I am working with. Once I added the line cout.setf(std::ios::fixed, std::ios::floatfield) my data appears to be formatted correctly, but I am getting extra numbers appended to the front of the actual number. so instead of printing 1.00, the program prints 40981.00, and it does this for all the results. (the preceding number does change to 4102x.xx) x being the desired output.

void print_div_values(mult_div_values ** table, float x, float y){

cout << endl << "Here is the division table: " << endl;

for (int i = 1; i <= y; i++)        
{
    cout << endl;

    for (int j = 1; j <= x; j++)    
    {
        cout << std::setw(5) << cout.setf(std::ios::fixed, std::ios::floatfield) << std::setprecision(2) << table[i][j].div;        
    }
    cout << endl;
}

Wouldn't a copy-paste do, why waste space?

legends2k
– legends2k

2015-01-07 18:43:25 +00:00
Commented Jan 7, 2015 at 18:43 — legends2k
– legends2k, Commented Jan 7, 2015 at 18:43
Yes, sorry will do that next time.

CavemanAGz
– CavemanAGz

2015-01-08 00:14:58 +00:00
Commented Jan 8, 2015 at 0:14 — CavemanAGz
– CavemanAGz, Commented Jan 8, 2015 at 0:14

Wintermute · Accepted Answer · 2015-01-07 18:42:21Z

5

std::ostream::setf returns the old flags, which are then formatted as an integer by cout. Use

cout.setf(std::ios::fixed, std::ios::floatfield);
cout << std::setw(5) << std::setprecision(2) << table[i][j].div;

answered Jan 7, 2015 at 18:42

Wintermute

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2 Comments

CavemanAGz Over a year ago

Thanks for the help. So my problem was the order and trying to do too many things in one line?

Wintermute Over a year ago

Sort of. If you want to do it in one line, you can write cout << setw(5) << setfixed << setprecision(2) << table[i][j].div; It's just that ostream::setf returns a number, and that was then printed; it's not a manipulator like the others.

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