Borland C++ Power Programming by Clayton Walnum

By Clayton Walnum

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You can answer this question easily, by examining a popular high-level language with good string handling, such as Borland’s Turbo Pascal. Examining Turbo Pascal yields a list of important string-handling functions. These functions are • String construction and destruction • String assignment • String concatenation • String comparison • String searches • String insertion • String deletion • String extraction • String retrieval Each function in the string class is covered in its own section. 1, the header file for the string class.

CPP—a new version of the car-driving program that gives PassingCar a test drive. at_destination) { cout << “Look out! 1 lp#4 Part I ■ DOS Topics Polymorphism The last major feature of object-oriented programming is polymorphism. By using polymorphism, you can create new objects that perform the same functions found in the ancestor object, but which perform one or more of these functions in a different way. For example, when the previous program used inheritance, it created a new car with a passing gear.

By overloading C++’s == operator, you can compare strings in a more natural way. s) == 0) return 1; return 0; } int String::operator==(char *ch) { if (strcmp(s, ch) == 0) return 1; return 0; } These functions differ only in the type of parameter they accept. Both use the C++ function strcmp() to compare two character arrays. Unlike the strcmp() function, however, which returns a false (0) value when the strings match, the string class’ comparison function returns true (1) for a match, and false (0) otherwise.

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