pvjc22/du6/program.c

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


int main() {

   char database[200][30];
   char string[30];
   int error = 0;
   int count = 0;
   int i = 0;
   
   memset(database, 0, sizeof(database));
   memset(string, 0, 30);
   char *r;
   r = fgets(string, 1000, stdin);
   if (r == NULL)
      return 0;
   sscanf(string, "%d", &count);
   if(strlen(r) == 1 || count < 1) {
      puts("Nespravny vstup");
      return 0;
   }
   for (int c = 0; c < 30; c++) {
      if (isalpha(r[c])) {
         error = 1;
         break;
      }
   }
   if (error != 0) {
      puts("Nespravny vstup");
      return 0;
   }
   

   while (strlen(r) > 1) {
      memset(string, 0, 30);
      r = fgets(string, 30, stdin);
      if (r == NULL)
         break;
      error = 0;
      for (int j = 0; j < 200; j++) {

         if (strcmp(database[j], string) == 0) {
            error = 1;
            break;
         }

      }

      if (error == 0 && strlen(r) > 1) {
         strcpy(database[i], r);
         i++;
      }

   }
   if (i == 0) {
   	puts("Ziadne prihlasky");
   }
   for (int j = 0; j < i; j++) {
      for (int k = 0; k < i; k++) {
         if (strcmp(database[j], database[k]) < 0) {
            char buffer[30];
            //memset(buffer, 0, sizeof(buffer));
            strcpy(buffer, database[j]);
            strcpy(database[j], database[k]);
            strcpy(database[k], buffer);
         }
      }
   }
   puts("Prijati studenti:");
   for (int j = 0; j < i; j++) {
      if (j == count) {
         puts("Neprijati studenti:");
      }
      printf("%s", database[j]);
   }
   return 0;
}