Is there a QString function that takes the type int as an argument and returns it as QString ?

_{Translation of the question “How to convert int to QString? ” @Ahmad .}

Answer 1, authority 100%

Method 1

Use QString :: number () :

int i = 42;
QString s = QString :: number (i);

Method 2

You can use the arg method:

QString QString :: arg (int a, int fieldWidth = 0, int base = 10, const QChar & amp; fillChar = QLatin1Char ('')) const

Method 3

And if you want to use the solution when concatenating strings, forget the + operator. Just do it like this:

// Qt 5 + C++ 11
auto i = 13;
auto printable = QStringLiteral ("My magic number is% 1. That's all!"). arg (i);
// Qt 5
int i = 13;
QString printable = QStringLiteral ("My magic number is% 1. That's all!"). Arg (i);
// Qt 4
int i = 13;
QString printable = QString :: fromLatin1 ("My magic number is% 1. That's all!"). Arg (i);

Method 4

Another way is to use QTextStream and the & lt; & lt; is similar to how you would use cout in C++:

QPoint point (5,1);
QString str;
QTextStream (& amp; str) & lt; & lt; "Mouse click: (" & lt; & lt; point.x () & lt; & lt; "," & lt; & lt; point.y () & lt; & lt; ").";
// OUTPUT:
// Mouse click: (5, 1).

Because the & lt; & lt; operator is overridden, it can be used for several types, not just int . QString :: arg () is overridden, for example, arg (int a1, int a2) , but arg (int a1, QString a2) is missing , so using QTextStream () and the & lt; & lt; operator is useful when formatting longer, mixed-type strings.

Warning : You might want to use sprintf () to reproduce printf () statements in C style, but I recommend using QTextStream or arg () as they support Unicode strings.

Method 5

Take a look at QString :: setNum () .

int i = 10;
double d = 10.75;
QString str;
str.setNum (i);
str.setNum (d);

setNum () is overridden in many ways. See the reference description for the QString class.

Method 6

Moreover, you can use QVariant to convert from different formats and to different formats. To convert int to QString we get:

QVariant (3) .toString ();

To convert type float to String or String to float :

QVariant (3.2) .toString ();
QVariant ("5.2"). ToFloat ();

_{Based on answers in “How to convert int to QString? “.}

Answer 2, authority 7%

casting a variable to a string type

QString str = QString ("% 1"). arg (x)

Or formatted string

QString str = QString ("x1 =% 1 x2 =% 2"). arg (x1) .arg ( x2)