#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>

struct student
{
  char name[100];
  int id;
  int grades;
};

student* get_mem(int size) {
return(student*)malloc(size * sizeof(student));
}

void input(student studentArr[], int len) {
    register int i;
    bool exit_cycle_check;
    int ascii_symbol;

    for (i = 0; i < len; i++) {
        printf("Person %d:\n", i + 1);

        const int ucll = 65; // Upper Case low limit ("A" имеет номер ASCII, равный 65)
        const int uchl = 90; // Upper Case high limit ("Z" имеет номер ASCII, равный 90)
        const int lcll = 97; // Lower Case low limit ("a" имеет номер ASCII, равный 97)
        const int lchl = 122; // Lower Case high limit ("z" имеет номер ASCII, равный 122)

        while (true) {
            exit_cycle_check = true;

            printf("Enter name = ");
            scanf("%s",&studentArr[i].name);

            for (register int j = 0; j < 100; j++) {
                ascii_symbol = studentArr[i].name[j];

                if (((ascii_symbol <= uchl) && (ascii_symbol >= ucll)) || ((ascii_symbol <= lchl) && (ascii_symbol >= lcll)) || (ascii_symbol == 0))
                    continue;
                else
                    exit_cycle_check = false;
                break;
            }

            if (exit_cycle_check)
                break;
            else
                printf("Incorrect input. Only letters are suitable\n");
        }

        while (true) {
            printf("Enter grades = ");
            scanf("%d",&studentArr[i].grades);

            if (studentArr[i].grades >= 0 && studentArr[i].grades <= 10)
                break;
            else
                printf("Incorrect input. Grade must be in range from 0 to 10\n");
        }

        printf("Enter id = ");
        scanf("%d",&studentArr[i].id);
        printf("\n");
    }
}

int main() {
    student* studentArr = get_mem(5);
    input(studentArr, 5);
    printf("------------------------\n\n");
    for (int i = 0; i < 5; i++) {
        printf("Person %d:\n", i + 1);
        printf("Name = %s\n", &studentArr[i].name);
        printf("ID = %d\n", studentArr[i].id);
        printf("Grades = %d\n\n", studentArr[i].grades);
    }

    delete []studentArr;
    return 0;
}