What are the basic data types in Qt?

Qt basic data types include string type, numeric type, container type, time type, etc. Detailed introduction: 1. String type, QString is used to store and operate Unicode strings, QByteArray is used to store and operate byte arrays; 2. Numeric type, divided into integer type and floating point type; 3. Container type, QList is used QVector is used to store a dynamic array of a group of objects, QMap is used to store an associative array of key-value pairs, etc.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Qt is a cross-platform C application development framework that provides a rich class library and tools for rapid development of graphical user interface (GUI) applications. Qt basic data types are the basic types used to store and operate data in the Qt framework, including the following:

String type:

QString: used for storage and manipulate Unicode strings. It supports string concatenation, interception, replacement, search and other operations, and provides a wealth of conversion functions for conversion between different encodings.

QByteArray: used to store and operate byte arrays. It can be used to process binary data or byte representation of text data.

Numeric type:

Integer type: Qt provides integer types of different sizes, including: bool, char, short, int, long, qint8, qint16, qint32 , qint64, etc. Among them, the qintX type is Qt's custom integer type, and its size will vary depending on the platform.

Floating point number types: Qt provides floating point number types of different precisions, including: float, double, qreal, etc. Among them, the qreal type is Qt's custom floating point number type, and its precision will vary depending on the platform.

Container type:

QList: A dynamic array used to store a set of objects. It supports fast insertion, deletion, search and other operations, and provides rich traversal and sorting functions.

QVector: Similar to QList, used to store a dynamic array of objects. QVector performs better when accessing elements randomly compared to QList.

QMap: An associative array used to store a set of key-value pairs. It supports fast insertion, deletion, search and other operations, and provides rich traversal and sorting functions.

QSet: A collection used to store a set of unique values. It supports fast insertion, deletion, search and other operations, and provides a wealth of traversal and intersection, union, difference and other operation functions.

Time type:

QDate: used to store and operate dates. It supports date calculation, formatting, comparison and other operations, and provides a wealth of conversion functions for conversion to and from strings.

QTime: used to store and operate time. It supports time calculation, formatting, comparison and other operations, and provides a wealth of conversion functions for conversion to and from strings.

QDateTime: Used to store and manipulate dates and times. It inherits from QDate and QTime, supports combined operations of date and time, and provides rich conversion functions for conversion to and from strings.

In addition to the above basic data types, Qt also provides many other types, such as: QUrl is used to process URL addresses, QVariant is used to store and operate different types of values, QColor is used to represent colors, and QImage is used to represent images etc. These types provide Qt applications with rich data manipulation capabilities, making it convenient for developers to process and display data.

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