119 lines
3.6 KiB
C
Executable File
119 lines
3.6 KiB
C
Executable File
/*
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In this task, you should get familiar with calloc() and free().
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The program tracks the attendance of students.
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The user can enter the number of students and then mark certain students as present.
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Use calloc() to allocate memory on the heap for the required number of students.
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All students are marked as absent by default since calloc() initializes by default with 0.
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If the memory allocation is not successful, print Memory allocation failed\n and immediately return the exit code 1.
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After allocating the memory, the user can enter student numbers (1-based, not 0-based) to mark them as present.
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When a student number is entered, the program should mark the corresponding student as present.
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Any student numbers that are not within the range of all student numbers
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(i.e., 1 to the entered number of students) should be ignored.
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If the user enters 0, the attendance check is done and the program prints the attendance record.
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For each student, print if the student is present or absent.
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Don’t forget to free the allocated memory using free() at the end of the main() function.
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Examples:
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Number of students: 12
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Enter student numbers to mark as present (1 to 12, 0 to end):
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1
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8
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4
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5
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3
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0
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Attendance record:
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Student 1: Present
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Student 2: Absent
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Student 3: Present
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Student 4: Present
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Student 5: Present
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Student 6: Absent
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Student 7: Absent
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Student 8: Present
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Student 9: Absent
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Student 10: Absent
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Student 11: Absent
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Student 12: Absent
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*/
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#include <stdio.h>
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#include <stdlib.h> // TODO: Include the required header file
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#include <stdbool.h>
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#define ganzzahl int
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#define gleitkomma float
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#define leere void
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#define NICHTS ((void*)0)
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#define schreibf printf
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#define liesf scanf
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#define falls if
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#define fuer for
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#define solange while
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#define mach do
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#define mach_weiter continue
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#define gib_zurueck return
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#define haupt main
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#define befreie free
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#define unsigniert unsigned
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ganzzahl* erstelleFeld ( ganzzahl anzahl_an_schuelern )
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{
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ganzzahl *studenten = (ganzzahl*) calloc(anzahl_an_schuelern,sizeof(ganzzahl));
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falls(studenten == NICHTS) gib_zurueck NICHTS;
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gib_zurueck studenten;
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}
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leere liesAnwesenheit ( ganzzahl* anwesenheit_der_studenten, ganzzahl anzahl_an_schuelern)
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{
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ganzzahl schueler = 0;
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schreibf("Enter student numbers to mark as present (1 to %d, 0 to end):\n", anzahl_an_schuelern); // TODO: Mark students as present
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ganzzahl benutzereingabe = 0;
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mach
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{
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liesf("%d", &benutzereingabe);
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schueler++;
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falls(benutzereingabe == 0) gib_zurueck;
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falls(benutzereingabe < 0) mach_weiter;
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falls(benutzereingabe > anzahl_an_schuelern - 1) mach_weiter;
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anwesenheit_der_studenten[benutzereingabe-1] = 1;
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}solange(benutzereingabe != 0 && schueler < anzahl_an_schuelern);
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}
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leere schreibAnwesenheit ( ganzzahl* anwesenheit_der_studenten, ganzzahl anzahl_an_schuelern )
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{
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schreibf("Attendance record:\n");
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fuer(ganzzahl schueler = 1; schueler <= anzahl_an_schuelern; schueler++)
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{
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schreibf("Student %d: %s\n", schueler, anwesenheit_der_studenten[schueler-1] == 0 ? "Absent" : "Present");
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}
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// TODO: Print the attendance record
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}
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ganzzahl haupt(leere)
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{
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ganzzahl anzahl_an_schuelern = 0;
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schreibf("Number of students: ");
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liesf("%d", &anzahl_an_schuelern);
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ganzzahl* anwesenheit = erstelleFeld(anzahl_an_schuelern); // TODO: Allocate memory
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falls ( anwesenheit == NICHTS ) { // TODO: Check if memory could be allocated
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schreibf("Memory allocation failed\n");
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gib_zurueck 1;
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}
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liesAnwesenheit(anwesenheit, anzahl_an_schuelern);
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schreibAnwesenheit(anwesenheit, anzahl_an_schuelern);
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befreie(anwesenheit); // TODO: Free the allocated memory
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gib_zurueck 0;
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} |