Intermediate C Programming, 2nd Edition

Chapter 18Programming Problems Using Structure

DOI: 10.1201/9781003257981-18

18.1 Sort a Person Database

This program sorts a database of people. Each person is an object with two attributes: name and age. The program sorts the people by ages or by names. The database is a text file containing two columns: age and name. A few lines of the database are shown below:

43   Peter 87   Linda 57   Gregory 61   Larry

This is the header file of the Person structure and the PersonDatabase structure.

1    // CH18:sort/person.h2    #ifndef PERSON_H3    #define PERSON_H4    typedef struct5    {6      int age;7      char * name;8    } Person;9    typedef struct10   {11     int number; // number of persons12     Person * * person; // array of pointers ...