How can i convert a single character in a QString into an integer ?

[Ahti]

Let me explain with the help of an example:-

say i have this QString :

int num = 0 ;
QString test = "1A52D" ;

and i want to convert a single character in a string ( say 2 ) into an integer so that the integer variable 'num' should store 2 in it.

this is what i do:

int num = 0 ;
QString test = "1A52D" ;
QString test123 = test[3] ;
num = test123.toInt() ;

when i run that code i get this error message :

"conversion from QCharRef to non-scalar type QString required"

[Camilo del Real]

QString test = "1A52D" ;
int test123 = test[2].digitValue();

[Pradeep Kumar]

Hi,
@Ahti

The below link might be useful to you.

https://forum.qt.io/topic/14739/converting-one-element-from-a-qstring-to-int-solved/6

which converts a character of a string to int.

Thanks,

[Pradeep Kumar]

With your example you have taken
QString stringValue = "1A52D" ;

Sample Code:

  QString stringValue = "1A52D" ;
   int num = 0 ;
  QStringList listStr;

for (int var = 0; var < stringValue.length(); ++var) {
    if (stringValue.at(var).isDigit()){
        int StringValue = stringValue.at(var).digitValue();
        qDebug () << "firstDigit" << StringValue << endl;
        listStr.append(QString::number(StringValue));
    }
}

Iterate and get the numeric values and add to StringList then get the values from StringList convert to int.

QString oneValue  = listStr.value(0);
QString twoValue  = listStr.value(0+1);
QString threeValue  = listStr.value(0+2);

qDebug() << " value" << oneValue << twoValue << threeValue <<  endl;

qDebug() <<  oneValue.toInt();
qDebug() <<  twoValue.toInt();
qDebug() <<  threeValue.toInt();

Assign which number you want to variable num.