pvjc24/cv10/program.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_NAME_LENGTH 100

int compare(const void *a, const void *b) {
    return strcmp(*(const char **)a, *(const char **)b);
}

void free_memory(char **array, int length) {
    for (int i = 0; i < length; i++) {
        free(array[i]);
    }
    free(array);
}

int main() {
    int max_students;
    char name[MAX_NAME_LENGTH];
    char **students = NULL;
    int num_students = 0;
    
  
    printf("Enter the maximum number of students that can be accepted: ");
    if (scanf("%d\n", &max_students) != 1 || max_students <= 0) {
        puts("Invalid input for the number of students.");
        return 1;
    }

  
    students = (char **)malloc(max_students * sizeof(char *));
    if (students == NULL) {
        puts("Memory allocation failed.");
        return 1;
    }

    printf("Enter student names (press Enter twice to stop):\n");
    while (fgets(name, MAX_NAME_LENGTH, stdin) && num_students < max_students) {
         name[strcspn(name, "\n")] = '\0'; 
        if (strlen(name) == 0) {
            break;
        }

 
        int duplicate = 0;
        for (int i = 0; i < num_students; i++) {
            if (strcmp(students[i], name) == 0) {
                duplicate = 1;
                break;
            }
        }

        if (!duplicate) {
             students[num_students] = strdup(name);
            if (students[num_students] == NULL) {
                puts("Memory allocation failed.");
                free_memory(students, num_students);
                return 1;
            }
            num_students++;
        }
    }

    if (num_students == 0) {
        puts("No applications were received.");
        free(students);
        return 1;
    }

     qsort(students, num_students, sizeof(char *), compare);

    puts("Accepted students:");
    for (int i = 0; i < num_students; i++) {
        puts(students[i]);
    }

     free_memory(students, num_students);

    return 0;
}