Question

Найти среднее арифметическое целых чисел в типизированном файле (file of integer), разница наибольшей и наименьшей цифр которых меньше 5. Если таких чисел нет, то результат- ноль. функция принимает в качестве параметра имя файла Name FUNCTION P(NAME:STRING):DOUBLE;

Answer 1

Finding the Arithmetic Mean of Integers in a Typed File

To find the arithmetic mean of integers in a typed file, we need to perform the following steps:

1. Open the file and read the integers. 2. Calculate the sum of all the integers. 3. Count the number of integers. 4. Calculate the arithmetic mean by dividing the sum by the count.

Here's an example implementation of the function `P` that takes the file name as a parameter and returns the arithmetic mean as a `DOUBLE`:

FUNCTION P(NAME: STRING): DOUBLE;
VAR
  F: FILE OF INTEGER;
  Num: INTEGER;
  Sum: INTEGER;
  Count: INTEGER;
BEGIN
  Sum := 0;
  Count := 0;
  
  // Open the file
  ASSIGN(F, NAME);
  RESET(F);
  
  // Read the integers and calculate the sum and count
  WHILE NOT EOF(F) DO
  BEGIN
    READ(F, Num);
    
    // Check if the difference between the largest and smallest digit is less than 5
    IF (ABS(MAXINTDIGIT(Num) - MININTDIGIT(Num)) < 5) THEN
    BEGIN
      Sum := Sum + Num;
      Count := Count + 1;
    END;
  END;
  
  // Close the file
  CLOSE(F);
  
  // Calculate the arithmetic mean
  IF Count > 0 THEN
    P := Sum / Count
  ELSE
    P := 0;
END;

Please note that the `MAXINTDIGIT` and `MININTDIGIT` functions are not standard Pascal functions. You would need to implement them yourself to find the largest and smallest digit of an integer.

Remember to replace `MAXINTDIGIT` and `MININTDIGIT` with the appropriate functions to find the largest and smallest digit of an integer.

Example usage: ```pascal VAR Mean: DOUBLE; BEGIN Mean := P('filename.txt'); WRITELN('The arithmetic mean is: ', Mean); END. ```

Make sure to replace `'filename.txt'` with the actual name of the file you want to process.

Please let me know if you need any further assistance!