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Having trouble with these c++ function prototypes, why do I keep getting errors

Having trouble with these c++ function prototypes, why do I keep getting errors

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Having trouble with these c++ function prototypes, why do I keep getting errors

Below is the transcription of the provided C++ header file code snippet, suitable for an educational website. It includes a description of the content and function prototypes. --- ```cpp #ifndef PE04_H #define PE04_H #include <string> // PLACE YOUR PROTOTYPES BELOW THIS LINE // A. int crypt(const bool& x, int& y); // B. string ord(string& ad); // C. void readLink(const double& a, const string& b, const bool& c); // D. bool dbClose(const string& s, const int& i); // E. string require(const string& a, bool& b); // PUT YOUR PROTOTYPES ABOVE THIS LINE #endif ``` ### Description This header file, `PE04_H`, defines several function prototypes intended for implementation elsewhere. Each function serves a specific purpose that should be elaborated upon within the implementation file (.cpp). ### Function Prototypes - **A. `int crypt(const bool& x, int& y);`** - **Parameters:** - `x`: A constant boolean reference. - `y`: An integer reference. - **Return Type:** Integer. - **B. `string ord(string& ad);`** - **Parameters:** - `ad`: A string passed by reference. - **Return Type:** String. - **C. `void readLink(const double& a, const string& b, const bool& c);`** - **Parameters:** - `a`: A constant double reference. - `b`: A constant string reference. - `c`: A constant boolean reference. - **Return Type:** Void. - **D. `bool dbClose(const string& s, const int& i);`** - **Parameters:** - `s`: A constant string reference. - `i`: A constant integer reference. - **Return Type:** Boolean. - **E. `string require(const string& a, bool& b);`** - **Parameters:** - `a`: A constant string reference. - `b`: A boolean reference. - **Return Type:** String. Each function prototype is included between the `#ifndef` / `#define` preprocessor directives, ensuring the header is only included once per compilation unit to prevent redefinition errors. The `#endif` marks the end of the conditional inclusion. This header
Transcribed Image Text:Below is the transcription of the provided C++ header file code snippet, suitable for an educational website. It includes a description of the content and function prototypes. --- ```cpp #ifndef PE04_H #define PE04_H #include <string> // PLACE YOUR PROTOTYPES BELOW THIS LINE // A. int crypt(const bool& x, int& y); // B. string ord(string& ad); // C. void readLink(const double& a, const string& b, const bool& c); // D. bool dbClose(const string& s, const int& i); // E. string require(const string& a, bool& b); // PUT YOUR PROTOTYPES ABOVE THIS LINE #endif ``` ### Description This header file, `PE04_H`, defines several function prototypes intended for implementation elsewhere. Each function serves a specific purpose that should be elaborated upon within the implementation file (.cpp). ### Function Prototypes - **A. `int crypt(const bool& x, int& y);`** - **Parameters:** - `x`: A constant boolean reference. - `y`: An integer reference. - **Return Type:** Integer. - **B. `string ord(string& ad);`** - **Parameters:** - `ad`: A string passed by reference. - **Return Type:** String. - **C. `void readLink(const double& a, const string& b, const bool& c);`** - **Parameters:** - `a`: A constant double reference. - `b`: A constant string reference. - `c`: A constant boolean reference. - **Return Type:** Void. - **D. `bool dbClose(const string& s, const int& i);`** - **Parameters:** - `s`: A constant string reference. - `i`: A constant integer reference. - **Return Type:** Boolean. - **E. `string require(const string& a, bool& b);`** - **Parameters:** - `a`: A constant string reference. - `b`: A boolean reference. - **Return Type:** String. Each function prototype is included between the `#ifndef` / `#define` preprocessor directives, ensuring the header is only included once per compilation unit to prevent redefinition errors. The `#endif` marks the end of the conditional inclusion. This header
Running PrototypeTester.cpp Error: ``` pe04.h:11:1: error: ‘string’ does not name a type; did you mean ‘stdin’? 11 | string ord(string& ad); | ^~~~~~ | stdin pe04.h:14:38: error: ‘string’ does not name a type; did you mean ‘stdin’? 14 | void readLink(const double& a, const string& b, const bool& c); | ^~~~~~ | stdin pe04.h:17:20: error: ‘string’ does not name a type; did you mean ‘stdin’? 17 | bool dbClose(const string& s, const int& i); | ^~~~~~ | stdin pe04.h:20:1: error: ‘string’ does not name a type; did you mean ‘stdin’? 20 | string require(const string& a, bool& b); | ^~~~~~ | stdin ``` **Explanation:** The provided compilation error messages indicate that the C++ compiler cannot recognize 'string' as a valid type. This error often occurs when the necessary header file (`<string>`) is not included. In each error message: - The line number and position are specified. - A suggestion is incorrectly made, offering 'stdin' as a replacement. - The source file in question is `pe04.h`. To fix these errors, ensure that the `<string>` header is included at the beginning of the source file or files where the `string` class is used. Usage should be prefixed with `std::` unless there is a `using namespace std;` directive.
Transcribed Image Text:Running PrototypeTester.cpp Error: ``` pe04.h:11:1: error: ‘string’ does not name a type; did you mean ‘stdin’? 11 | string ord(string& ad); | ^~~~~~ | stdin pe04.h:14:38: error: ‘string’ does not name a type; did you mean ‘stdin’? 14 | void readLink(const double& a, const string& b, const bool& c); | ^~~~~~ | stdin pe04.h:17:20: error: ‘string’ does not name a type; did you mean ‘stdin’? 17 | bool dbClose(const string& s, const int& i); | ^~~~~~ | stdin pe04.h:20:1: error: ‘string’ does not name a type; did you mean ‘stdin’? 20 | string require(const string& a, bool& b); | ^~~~~~ | stdin ``` **Explanation:** The provided compilation error messages indicate that the C++ compiler cannot recognize 'string' as a valid type. This error often occurs when the necessary header file (`<string>`) is not included. In each error message: - The line number and position are specified. - A suggestion is incorrectly made, offering 'stdin' as a replacement. - The source file in question is `pe04.h`. To fix these errors, ensure that the `<string>` header is included at the beginning of the source file or files where the `string` class is used. Usage should be prefixed with `std::` unless there is a `using namespace std;` directive.
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