Add students archive.
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37
04_strukturen/main.c
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37
04_strukturen/main.c
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/*
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* Vervollständigen Sie das untenstehende Programm, indem Sie das Modul namesarchive in der
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* namesarchive.h bzw. namesarchive.c implementieren.
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* Die öffentlichen Schnittstellen mit genaueren Details entnehmen Sie der namesarchive.h.
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* Das Programm soll das Modul als dynamische Laufzeitbibliothek nutzen.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "namesarchive.h"
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int main(int argc, char *argv[])
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{
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addStudent("Zorro", 999);
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addStudent("Adam", 123);
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addStudent("Fred", 789);
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addStudent("Anna", 456);
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addStudent("Zorro", 111);
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printf("\nNach Eingabe:\n");
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printStudents();
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sortStudents();
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printf("\nNach Sortierung:\n");
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printStudents();
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removeStudent("Anna");
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removeStudent("Karl");
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printf("\nNach Entfernen:\n");
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printStudents();
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return EXIT_SUCCESS;
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}
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16
04_strukturen/makefile
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04_strukturen/makefile
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namesarchive: main.o libnamesarchive.so
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gcc -Wall -o namesarchive main.o libnamesarchive.so
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main.o: main.c
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gcc -c -Wall main.c
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namesarchive.o: namesarchive.c namesarchive.h
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gcc -c -Wall namesarchive.c
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libnamesarchive.so: namesarchive.o
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gcc -shared -o libnamesarchive.so namesarchive.o
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clean:
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del /f namesarchive.exe *.o *.so
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# Comment line above and uncomment line below for UNIX systems
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# rm -f namesarchive *.o *.so
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89
04_strukturen/namesarchive.c
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04_strukturen/namesarchive.c
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#include "namesarchive.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#define INDEX_NOT_FOUND -1
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typedef struct
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{
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char name[MAX_NAME_LEN+1];
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unsigned int id;
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} Student;
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Student students[MAX_NAMES];
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unsigned int numberOfEntries = 0;
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int addStudent(const char *name, unsigned int id)
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{
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if(numberOfEntries < MAX_NAMES)
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{
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strncpy(students[numberOfEntries].name, name, MAX_NAME_LEN+1);
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students[numberOfEntries].name[MAX_NAME_LEN] = '\0';
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students[numberOfEntries].id = id;
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numberOfEntries++;
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return 1;
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}
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return 0;
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}
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void printStudents()
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{
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for(int i = 0; i < numberOfEntries; i++)
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{
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printf("%s: %u\n", students[i].name, students[i].id);
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}
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}
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static int getNameIdx(const char *name)
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{
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for(int i = 0; i < numberOfEntries; i++)
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{
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if(strcmp(name, students[i].name) == 0)
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return i;
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}
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return INDEX_NOT_FOUND;
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}
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static void removeAt(int idx)
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{
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for(int i = idx; i < numberOfEntries-1; i++)
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{
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students[i] = students[i+1];
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}
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numberOfEntries--;
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}
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Status removeStudent(const char *name)
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{
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int idx = getNameIdx(name);
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if(idx == INDEX_NOT_FOUND)
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{
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return REMOVE_ERROR;
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}
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else
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{
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removeAt(idx);
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return STATUS_OK;
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}
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}
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static int compareStudents(const void *arg1, const void *arg2)
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{
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const Student *student1 = (const Student *)arg1;
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const Student *student2 = (const Student *)arg2;
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int nameDiff = strcmp(student1->name, student2->name);
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if(nameDiff == 0)
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return student1->id - student2->id;
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else
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return nameDiff;
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}
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void sortStudents()
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{
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qsort(students, numberOfEntries, sizeof(Student), compareStudents);
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}
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25
04_strukturen/namesarchive.h
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25
04_strukturen/namesarchive.h
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#ifndef NAMEARCHIVE_H
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#define NAMEARCHIVE_H
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// Maximale Namenslänge
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#define MAX_NAME_LEN 10
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// Maximale Anzahl an Namen
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#define MAX_NAMES 100
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typedef enum {IO_ERROR, STATUS_OK, REMOVE_ERROR} Status;
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// Fügt einen Namen hinzu. Im Fehlerfall (Archiv ist voll) soll 0, ansonsten 1 zurückgegeben werden.
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// Ist der angegebene Name länger als die zulässige Namenslänge, wird der Name abgeschnitten hinzugefügt. Rückgabe ist dann 1.
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int addStudent(const char *name, unsigned int id);
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// Wie addName. Fügt Namen aber direkt sortiert hinzu. Voraussetzung ist ein bereits sortiertes Archiv.
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int addStudentSorted(const char *name, unsigned int id);
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// Entfernt den angegebenen Namen. Gibt bei Erfolg 1 zurück, ansonsten 0 (Name konnte nicht gefunden werden).
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Status removeStudent(const char *name);
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// Sortiert die Namen im Archiv aufsteigend.
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void sortStudents();
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// Gibt die Namen zeilenweise aus.
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void printStudents();
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#endif
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