Chapter 10: Problem 8

How do you compare string class objects?

Short Answer

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Answer: The main ways to compare string class objects are by using comparison operators (e.g., "==", "!=", "<", "<=", ">", ">=") and built-in string comparison functions/methods such as 'compare()' in C++ and 'compareTo()' in Java. These methods return an integer value indicating the lexicographic relationship between the two strings (negative for less than, zero for equal, positive for greater than).

Step by step solution

Understand string class objects

String class objects are instances of the string class in programming languages, such as C++ or Java. They store sequences of characters and have built-in functions that help with string manipulation and comparison.

Use comparison operators

Comparison operators, such as "==" (equality), "!=" (inequality), "<" (less than), "<=" (less than or equal to), ">" (greater than), and ">=" (greater than or equal to), can be used to compare the content of string class objects. These operators take two string objects and return a boolean value, such as true or false, based on the result of the comparison. For example, consider two strings s1 and s2. The statement "s1 == s2" returns true if both strings have the same content, and false otherwise.

Use built-in string comparison functions/methods

Some programming languages provide built-in functions/methods for string comparison, such as the 'compare()' method in C++ and 'compareTo()' method in Java. These functions/methods return an integer value indicating the relationship between the compared strings: - A negative value when the first string is less than the second string (lexicographically) - Zero when the strings are equal (have the same content) - A positive value when the first string is greater than the second string (lexicographically) For example, in C++, you can use the 'compare()' method: ```cpp #include #include int main() { std::string s1 = "hello"; std::string s2 = "world"; int result = s1.compare(s2); // result will be a negative value return 0; } ``` In Java, you can use the 'compareTo()' method: ```java public class Main { public static void main(String[] args) { String s1 = "hello"; String s2 = "world"; int result = s1.compareTo(s2); // result will be a negative value } } ``` In both cases, a negative value will be returned as 'hello' is lexicographically less than 'world'.

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How do you compare string class objects?

Short Answer

Step by step solution

Understand string class objects

Use comparison operators

Use built-in string comparison functions/methods

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