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function strcpy( ) This function contains no provision for checking the boundary of the target array If the source array contains more characters than the target array can hold, then a program error or system crash is possible (likely) As you will see, the standard string class prevents such errors In the final analysis, there are three reasons for the inclusion of the standard string class: consistency (a string now defines a data type), convenience (you can use the standard C++ operators), and safety (array boundaries will not be overrun) Keep in mind that there is no reason that you should abandon normal, null-terminated strings altogether They are still the most efficient way in which to implement strings However, when speed is not an overriding concern, using the new string class gives you access to a safe and fully integrated way to manage strings Although not traditionally thought of as part of the STL, string is another container class defined by C++ This means that it supports the algorithms described in the previous section However, strings have additional capabilities To have access to the string class, you must include <string> in your program The string class is very large, with many constructors and member functions Also, many member functions have multiple overloaded forms For this reason, it is not possible to look at the entire contents of string in this chapter Instead, we will examine several of its most commonly used features Once you have a general understanding of how string works, you will be able to easily explore the rest of it on your own The string class supports several constructors The prototypes for three of its most commonly used constructors are shown here string( ); string(const char *str); string(const string &str); The first form creates an empty string object The second creates a string object from the null-terminated string pointed to by str This form provides a conversion from nullterminated strings to string objects The third form creates a string from another string A number of operators that apply to strings are defined for string objects, including:.

If the size of this word takes it past the right margin, then adjust the drawing coordinates to start a new line.

These operators allow the use of string objects in normal expressions and eliminate the need for calls to functions such as strcpy( ) or strcat( ), for example In general, you can mix string objects with normal, null-terminated strings in expressions For example, a string object can be assigned a null-terminated string The + operator can be used to concatenate a string object with another string object or a string object with a C-style string That is, the following variations are supported string + string string + C-string C-string + string The + operator can also be used to concatenate a character onto the end of a string The string class defines the constant npos, which is 1 This constant represents the length of the longest possible string The C++ string classes make string handling extraordinarily easy For example, using string objects you can use the assignment operator to assign a quoted string to a string, the + operator to concatenate strings, and the comparison operators to compare strings The following program illustrates these operations

Draw this word at the current position, and adjust the x coordinate appropriately. When finished drawing the text, adjust the printable area to exclude the area just drawn.

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// A short string demonstration #include <iostream> #include <string> using namespace std; int main() { string str1("Alpha"); string str2("Beta"); string str3("Omega"); string str4;

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When you test this code, make sure it works properly when printing with both landscape and portrait orientation. The page setup dialog can be used to alter the orientation, as well as the margins on the page. For further information on printing, or for details on the classes or methods used here, consult the .NET Framework online documentation.