I am including the header file <string>, and I am using the string class, but the code doesn't compile? (namespace resolution, having the std:: topics) How do I use unique() with vectors? (answered only once, but still a good question to have due to people not knowing that it's possible to do)

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Well, printf does it for output, so look at its related function named sprintf that "prints formated output to a string."

It's easy. Use sprintf. For example: char string1[50]; char string2[50]; short int var1; float var2; ... sprintf (string1, "%d", var1); sprintf (string2, "%f", var2);

You want to make a function that converts from a type to another. Like from std::string to int, or the other way around. This can be done using std::stringstream and insertion / extraction operators. Just as above, templates will prove of great help: Its usage is not as straightforward as the above explained max template. Normally, you would want to call it like "int value = lexical_cast( myStdString );". There is, however, a problem.

There are two easy ways to do this: you can use the <cstdio> facilities or the <iostream> library. In general, you should prefer the <iostream> library.

If you are reading a host's address from the command line, you may not know if you have an aaa.bbb.ccc.ddd style address, or a host.domain.com style address. What I do with these, is first try to use it as a aaa.bbb.ccc.ddd type address, and if that fails, then do a name lookup on it. Here is an example: Converts ascii text to in_addr struct. NULL is returned if the address can not be found.

In general, when you want to convert from one type to another, the first class to look at is System.Convert. It has a load of static methods which are likely to help you. If you're converting from a String, you could also check whether the type that you want to convert to has a Parse method or something similar - for instance, I usually use DateTime.ParseExact to convert from a String to a DateTime.

Some libraries have routines strupr and strlwr or strupper and strlower, but these are not Standard or portable. It's a straightforward exercise to write upper/lower-case functions in terms of the toupper and tolower macros in <ctype.h>; see also question 13.5. (The only tricky part is that the function will either have to modify the string in-place or deal with the problem of returning a new string; see question 7.5a.

There are several ways. The most straightforward is: String myString = numString.trim(); int i = Integer.parseInt(myString); long l = Long.parseLong(myString) or String myString = numString.trim(); i = Integer.parseInt(myString,myIntRadix); Note 1: There is a gotcha with parseInt - it will throw a NumberFormatException for String values in the range "80000000" to "ffffffff". You might expect it to interpret them as negative, but it does not. The values have to be "-80000000" .

Try any of these: String s = String.valueOf(i); or String s = Integer.toString(i); or String s = Integer.toString(i, radix); or // briefer but may result in extra object allocation. String s = "" + i; Note: There are similar classes for Double, Float, Long, etc.

OCTET STRING value like 73:63:6f:74:74:79 can be converted into a readable string (DisplayString) by formatting it according to the DisplayString textual convention.

There is no 'right' answer to this question; many lisp programmers have rolled their own solution in the past, and others are of the view that it should never be necessary, as long as all sequence functions are used with consistent :start and :end arguments. However, a community-based 'standard' was developed in June/July 2001 on comp.lang.lisp; known as SPLIT-SEQUENCE (formerly PARTITION), it works as follows in its simplest form: split-sequence #\Space "A stitch in time saves nine.

The ANSI mktime() function converts a struct tm to a time_t. No standard routine exists to parse strings.

These days, it's not necessary to use the Symbian cast macros (eg REINTERPRET_CAST) since these are simply defined as the equivalent C++ standard (eg reinterpret_cast). They're a legacy from when GCC didn't support the casts.

How to add a float (or "any" type really) to the end of a C++ string? Unlike routines like atoi mentioned in the previous question, there is no direct routine such as itoa available. However, similar to the string I/O routines in the previous question, one can do this: #include <stdio.h> // cstdio in C++ // ..

Java.lang.String has certain utilities to convert a string into a byte array and visa versa. A string can be converted correctly and fully into a byte array by using a character encoding such as UTF-8, US-ASCII. All the overloaded String.getBytes() methods will convert a string into a byte array. Some of these methods take an encoding identifier as an argument, while others take no arguments and will use the platform's default encoding to convert the string.

You use static members of the Convert class found in the System namespace to handle conversions in the .NET framework.

There are two easy ways to do this: you can use the <cstdio> facilities or the <iostream> library. In general, you should prefer the <iostream> library. The <iostream> library allows you to convert pretty much anything to a std::string using the following syntax (the example converts a double, but you could substitute pretty much anything that prints using the << operator): The std::ostringstream object o offers formatting facilities just like those for std::cout.