Question

Написать программу в Pascal, с оператором while и doНайти сумму всех n-значных чисел, если 1 ≤ n ≤ 4

Answer 1

Var
  i, sum : integer;
begin
  sum := 0;
  for i := 1 to 9999 do
    sum := sum + i;
  write('Результат: ', sum);
end.

Answer 2

Writing a Program in Pascal to Find the Sum of All n-Digit Numbers

To write a program in Pascal to find the sum of all n-digit numbers, we can use a combination of the `while` and `do` loops to iterate through the numbers and calculate their sum.

Here's a Pascal program to achieve this:

program SumOfNDigitNumbers;

var
  n, i, number, sum: integer;

begin
  sum := 0;

for n := 1 to 4 do
  begin
    i := 1;
    number := 1;

while i < n do
    begin
      number := number * 10;
      i := i + 1;
    end;

repeat
      sum := sum + number;
      number := number + 1;
    until number = (number * 10);
  end;

writeln('The sum of all ', n, '-digit numbers is: ', sum);
end.

Explanation: - The program starts by initializing the variables `n`, `i`, `number`, and `sum`. - It then uses a `for` loop to iterate through the values of `n` from 1 to 4, representing the number of digits. - Inside the `for` loop, a `while` loop is used to generate the n-digit numbers and calculate their sum. - The `repeat` loop is used to iterate through all the n-digit numbers and add them to the `sum`. - Finally, the program outputs the sum of all n-digit numbers for each value of `n`.

This program calculates the sum of all 1 to 4-digit numbers using the `while` and `do` loops in Pascal.