QString - no member function called 'find'

[pitterb]

I wrote a function:

#include<qstring.h>
 
void Calculator::calculation(QString &operation, QString &text_display)
{
	QString a_string = "", b_string = "", result_string = "";
	double a, b, result;
	int position = 0, i, j;
 
	while(1)
	{
		if ( ( position = operation.find('*') ) == -1 ) break;
 
		for( i = position; i = 0 ; i-- )
		{
			if( operation.at( i ) == '*' || operation.at( i ) == '/' || operation.at( i ) == '+' || operation.at( i ) == '-' )
				break;
			a_string += operation.at( i );
		}
		for( j = position; j < operation.length() ; j++ )
		{
			if( operation.at( j ) == '*' || operation.at( j ) == '/' || operation.at( j ) == '+' || operation.at( j ) == '-' )
				break;
			b_string += operation.at( j );
		}
		a = a_string.toDouble();
		b = b_string.toDouble();
		result = a*b;
		result_string = result_string.setNum( result, 'f', 10 );
		operation.replace( i, i + j + 1, result_string );
	}
	text_display = result_string;
	ui.display->setText( text_display );
}

#include<qstring.h>

void Calculator::calculation(QString &operation, QString &text_display)
{
	QString a_string = "", b_string = "", result_string = "";
	double a, b, result;
	int position = 0, i, j;

	while(1)
	{
		if ( ( position = operation.find('*') ) == -1 ) break;

		for( i = position; i = 0 ; i-- )
		{
			if( operation.at( i ) == '*' || operation.at( i ) == '/' || operation.at( i ) == '+' || operation.at( i ) == '-' )
				break;
			a_string += operation.at( i );
		}
		for( j = position; j < operation.length() ; j++ )
		{
			if( operation.at( j ) == '*' || operation.at( j ) == '/' || operation.at( j ) == '+' || operation.at( j ) == '-' )
				break;
			b_string += operation.at( j );
		}
		a = a_string.toDouble();
		b = b_string.toDouble();
		result = a*b;
		result_string = result_string.setNum( result, 'f', 10 );
		operation.replace( i, i + j + 1, result_string );
	}
	text_display = result_string;
	ui.display->setText( text_display );
}

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Compiler says that QString class has no member function called 'find' (line 11), but when I read QString documentation...

http://doc.trolltech.com/3.3/qstring.html#find

...it's right there. Every other function like lenght() or at() works. What's wrong then?

[wysota]

It's from Qt3 and you are using Qt4. Use QString::indexOf().