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#if defined(_WIN32) // количество цифр в INT_MAX
	#define MAX_TYPE 10
#elif defined(_WIN64)
	#define MAX_TYPE 19
#endif
double Racially_Correct_Input(char a[]) //функция для ввода допустимых значений с клавиатуры
{
	double c, num, z;
	int i = 0;
	int flagpoint = 0; //признак того, что точка есть в числе
	char str[MAX_TYPE + 2];//строка с числом
	while ((c = getch()) != 13 || i == 0) //ввод числа до нажатия enter
	{
		if (i > MAX_TYPE ) //проверка на домустимый размер числа (проверка при помощи INT_MAX есть на выходе)
		{
			for (i; i > 1; str[i--])//очистка экрана от введённого числа
			{
				printf("\b \b");
			}
			printf("\b \b");
			printf("Nedopustimii razmer!");
			getch();
			for (int j = 0; j < 20; j++) //очистка консоли от printf("Nedopustimii razmer!"); 
			{
				printf("\b \b");
			}
			if (a == "int") return Racially_Correct_Input("int");// если нужно НАТУРАЛЬНОЕ число
			if (a == "double") return Racially_Correct_Input("double");//всё остальное
		}
		if (isdigit(c) || (c == '-') && (i == 0) && a == "double" || a == "double" && (c == '.') && !flagpoint)  //Если символ является цифрой или знаком  /* || c == '.'*/)
 
			{
				if (c == '.') { flagpoint = 1; z = i; } //Если ввели точку, меняем флаг, обозначающий, что точка введена	
 
				str[i++] = (char)c;
				putch(c);
			}
			else if (c == 8 && i > 0) // 8 - keys BACKSPACE
			{
				printf("\b \b"); // destructive backspace
				if (i - 1 == z) flagpoint = 0;
				str[i--] = (char)c;
			}
			else if (c == 27) //выход из программы и очистка памяти при помощи самопальной функции
			{
				Free(A);
				exit(1);
			}
			else if (c == 32 ) //рестарт программы
			{
				Free(A);
				menu();
			}
	}
	str[i] = '\0'; //Сформированную строку заершаем признаком окончания строки
 
	num = atof(str); //Преобразуем строку в число с точкой
	if (atof(str) > INT_MAX)
	{
		printf("\nNedopustimii razmer!\n");
		if (a == "int") return Racially_Correct_Input("int");
		if (a == "double") return Racially_Correct_Input("double");
	}
	return num;
}

prog.cpp: In function 'double Racially_Correct_Input(char*)':
prog.cpp:11:11: error: 'MAX_TYPE' was not declared in this scope
  char str[MAX_TYPE + 2];//строка с числом
           ^
prog.cpp:12:20: error: 'getch' was not declared in this scope
  while ((c = getch()) != 13 || i == 0) //ввод числа до нажатия enter
                    ^
prog.cpp:16:19: error: 'str' was not declared in this scope
    for (i; i > 1; str[i--])//очистка экрана от введённого числа
                   ^
prog.cpp:18:19: error: 'printf' was not declared in this scope
     printf("\b \b");
                   ^
prog.cpp:20:18: error: 'printf' was not declared in this scope
    printf("\b \b");
                  ^
prog.cpp:27:55: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
    if (a == "int") return Racially_Correct_Input("int");// если нужно НАТУРАЛЬНОЕ число
                                                       ^
prog.cpp:28:61: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
    if (a == "double") return Racially_Correct_Input("double");//всё остальное
                                                             ^
prog.cpp:30:16: error: 'isdigit' was not declared in this scope
   if (isdigit(c) || (c == '-') && (i == 0) && a == "double" || a == "double" && (c == '.') && !flagpoint)  //Если символ является цифрой или знаком  /* || c == '.'*/)
                ^
prog.cpp:35:5: error: 'str' was not declared in this scope
     str[i++] = (char)c;
     ^
prog.cpp:36:12: error: 'putch' was not declared in this scope
     putch(c);
            ^
prog.cpp:40:19: error: 'printf' was not declared in this scope
     printf("\b \b"); // destructive backspace
                   ^
prog.cpp:42:5: error: 'str' was not declared in this scope
     str[i--] = (char)c;
     ^
prog.cpp:46:10: error: 'A' was not declared in this scope
     Free(A);
          ^
prog.cpp:46:11: error: 'Free' was not declared in this scope
     Free(A);
           ^
prog.cpp:47:11: error: 'exit' was not declared in this scope
     exit(1);
           ^
prog.cpp:51:10: error: 'A' was not declared in this scope
     Free(A);
          ^
prog.cpp:51:11: error: 'Free' was not declared in this scope
     Free(A);
           ^
prog.cpp:52:10: error: 'menu' was not declared in this scope
     menu();
          ^
prog.cpp:55:2: error: 'str' was not declared in this scope
  str[i] = '\0'; //Сформированную строку заершаем признаком окончания строки
  ^
prog.cpp:57:16: error: 'atof' was not declared in this scope
  num = atof(str); //Преобразуем строку в число с точкой
                ^
prog.cpp:58:18: error: 'INT_MAX' was not declared in this scope
  if (atof(str) > INT_MAX)
                  ^
prog.cpp:60:36: error: 'printf' was not declared in this scope
   printf("\nNedopustimii razmer!\n");
                                    ^
prog.cpp:61:54: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
   if (a == "int") return Racially_Correct_Input("int");
                                                      ^
prog.cpp:62:60: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
   if (a == "double") return Racially_Correct_Input("double");
                                                            ^

Standard output is empty