Manipulating member name to be controlled by string

I have a 10 by 10 grid of frames, i can change their backgrounds with

Code:

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ui->box_9_9->setStyleSheet("background-color: rgb(255,0,0)");

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but that's a lot of code, id like to have a For Loop

Code:

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int count;
    QString boxnum;
    for (count = 0; count <= 10; count++)
    {
        boxnum += "box_";
        boxnum += QString::number(count);
        boxnum += "_";
        boxnum += QString::number(count);
        ui->boxnum->setStyleSheet("background-color: rgb(255,0,0)");
    }

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but i get an error. What am i doing wrong?

This is C++, a static-typed compilable language. An identifier has to be an identifier and not a string containing textual representation of an identifier. You can probably do this instead:

Code:

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QFrame *frm = findChild<QFrame*>(QString("box_%1_%1").arg(count));
if(frm)
    frm->setStyleSheet(...);

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that worked for a diagonal line, how do i get it to go row by row or column by column?

Wysota's solution does what your pseudo-code does. Think about what Wysota gave you and adapt.

Two hints: more than one loop, and find a good introductory programming text.