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How to change string into QString?

...QString::fromStdString(str); If by string you mean Ascii encoded const char * then you can use this method: QString QString::fromAscii(const char * str, int size = -1) const char* str = "Hello world"; QString qstr = QString::fromAscii(str); If you have const char * encoded with system enco...
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What is the difference between static_cast and C style casting?

...situations where all that is needed is a simple conversion. The ability to select between several different casting operators of differing degrees of power can prevent programmers from inadvertently casting to an incorrect type. ...
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Search an Oracle database for tables with specific column names?

... To find all tables with a particular column: select owner, table_name from all_tab_columns where column_name = 'ID'; To find tables that have any or all of the 4 columns: select owner, table_name, column_name from all_tab_columns where column_name in ('ID', 'FNAME', ...
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const char *, char const *, char * const 异同?const修饰符各位置有何区...

const char * p = new char('a'); 这个是常字符,即p的内容不能被修改。 char const * p 意义同上,没有区别。 这时,*p = 'c'; 会报错。 char * const p = new char('a'); 这个是常指针,即p指针本身不可被修改。 这时,p = new char; 会报...
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How to raise a ValueError?

I have this code which finds the largest index of a specific character in a string, however I would like it to raise a ValueError when the specified character does not occur in a string. ...
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How to create CSV Excel file C#? [closed]

...Object = obj; var line = String.Join(delimeter, propertyInfos.Select(x => SanitizeValuesForCSV(x.GetValue(localObject, null), delimeter))); sb.AppendLine(line); } return sb.ToString(); } private static string SanitizeValuesForCSV(object value, s...
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How can I increment a char?

I'm new to Python, coming from Java and C. How can I increment a char? In Java or C, chars and ints are practically interchangeable, and in certain loops, it's very useful to me to be able to do increment chars, and index arrays by chars. ...
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Single quotes vs. double quotes in C or C++

... In C and in C++ single quotes identify a single character, while double quotes create a string literal. 'a' is a single a character literal, while "a" is a string literal containing an 'a' and a null terminator (that is a 2 char array). In C++ the type of a character lite...
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Is there an auto increment in sqlite?

... In case it is not obvious from answer, you can use ROWID in your select statement e.g. select rowid from people; – Colin D Mar 20 '17 at 15:37 ...
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Implicit type conversion rules in C++ operators

...re promoted to int Note. The minimum size of operations is int. So short/char are promoted to int before the operation is done. In all your expressions the int is promoted to a float before the operation is performed. The result of the operation is a float. int + float => float + float = flo...