Get and Set Methods

[ChrisW67]

void PatientGui::setID(const QString &value)
{
    ID = ui->nric->text();
}

void PatientGui::setID(const QString &value)
{
    ID = ui->nric->text();
}

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makes little sense. Try:

void PatientGui::setID(const QString &value)
{
    ID = value;
}

void PatientGui::setID(const QString &value)
{
    ID = value;
}

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if you want the obvious setter to match your getter.