gistfile1.c

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

#define N 1000

char *student_list[N];

void debt();
void student_average_scope();
void group_average_scope();

int main() {
  FILE *file;
  int choice;
  char buffer[200];
  int i = 0;

  file = fopen("students.txt", "r");

  if (file == NULL) {
    puts("students.txt не найден");
    return 1;
  }

  while (fgets(buffer, sizeof buffer, file) != NULL) {
    student_list[i++] = strdup(buffer);
  }

  fclose(file);

  do {
    puts("\nВыберите номер пункта меню:");
    puts("1 - Cтуденты, имеющие задолженности");
    puts("2 – Средний балл каждого студента");
    puts("3 – Средний балл всей группы");
    puts("4 - Выход\n");

    scanf("%d", &choice);

    switch (choice) {
      case 1:
        debt();
        break;
      case 2:
        student_average_scope();
        break;
      case 3:
        group_average_scope();
        break;
      case 4:
        break;
      default:
        puts("\nНужно вводить номер пункта от 1 до 4");
        break;
    }
  } while (choice != 4);
  return 0;
}

void debt() {
  char name[100];
  char test[15];
  wchar_t test2[15];
  wchar_t * pch;
  int group;
  int exam;
  int counter_debt;
  int i;

  for (i = 0; i < 4; i++) {
    counter_debt = 0;
    sscanf(student_list[i], "%d %[^0-9] %d %s", &group, name, &exam, test);
    mbstowcs(test2, test, 15);

    pch = wcschr(test2, L'н');
    while (pch != NULL) {
      counter_debt++;
      pch = wcschr(pch + 1, L'н');
    }
    printf("%i", counter_debt);

    /* if (counter_debt > 0) { */
    /* printf("%d %s-- задолженностей: %d\n", group, name, counter_debt); */
    /* } */
  }
}


void student_average_scope() {
  char name[50];
  int group;
  int exam;

  for (int i = 0; i < 4; i++) {
    int average = 0;
    int digit = 0;
    int counter_digits = 0;

    sscanf(student_list[i], "%d %[^0-9] %d", &group, name, &exam);

    while (exam > 0) {
      digit = exam % 10;
      average += digit;
      counter_digits++;
      exam = exam / 10;
    }

    printf("%d %s-- %.1f\n", group, name, (double)average / counter_digits);
  }
}