We experienced a massive site failure yesterday evening, with the database corrupted. Those of you familiar with the intricate workings of WordPress will know that the database holds everything — all the content, all the comments, all the configuration data. When the database goes, the site goes. Fortunately, the database …
Inserting Inserting characters into an existing string can be done via the insert() function. Here’s a crazy version of insert() that allows you to insert a substring into a string at an arbitrary index: There is a flavor of insert() that inserts the first portion of a C-style string: There’s …
Appending Appending strings to the end of an existing string is easy using either operator+=, append(), or push_back(). There’s also a flavor of append() that can append a substring: Operator+= and append() also have versions that work on C-style strings: There is an additional flavor of append() that works on …
String assignment The easiest way to assign a value to a string is to use the overloaded operator= function. There is also an assign() member function that duplicates some of this functionality. The assign() member function also comes in a few other flavors: Swapping If you have two strings and …
Character access There are two almost identical ways to access characters in a string. The easier to use and faster version is the overloaded operator[]: There is also a non-operator version. This version is slower since it uses exceptions to check if the nIndex is valid. If you are not …
Once you’ve created strings, it’s often useful to know how long they are. This is where length and capacity operations come into play. We’ll also discuss various ways to convert std::string back into C-style strings, so you can use them with functions that expect strings of type char*. Length of …
In this lesson, we’ll take a look at how to construct objects of std::string, as well as how to create strings from numbers and vice-versa. String construction The string classes have a number of constructors that can be used to create strings. We’ll take a look at each of them …
The standard library contains many useful classes — but perhaps the most useful is std::string. std::string (and std::wstring) is a string class that provides many operations to assign, compare, and modify strings. In this chapter, we’ll look into these string classes in depth. Note: C-style strings will be referred to …
Now that you’ve learned some basics about programs, let’s look more closely at how to design a program. When you sit down to write a program, generally you have some kind of idea, which you’d like to write a program for. New programmers often have trouble figuring out how to …
In the previous lesson , we introduced the concept of random number generation, and discussed how PRNG algorithms are typically used to simulate randomness in programs. In this lesson, we’ll take a look at how to generate random numbers in your programs. To access any of the randomization capabilities in …
