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How to convert string to double ?

I’m new to qml.. Can anyone tell me how to convert String to double or long long value ? I mean I want a double or long long result. I’m writing an application for a large calculation… And want to add comma (,) after 3 digit and also need 5 precision. I mean I want something like —> 12,345,678.976548 How can I do that…???     TextInput {         id: textInput1         width: 146         height: 37         text: qsTr("Text Input")         font.pixelSize: 12     }       TextInput {         id: textInput2         width: 142         height: 37         text: qsTr("Text Input")         font.pixelSize: 12     }         Button {         height: 30         width: 100         onClicked: {             root.text = textInput1 + textInput2         }     }

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