Не понятное мне задание

Const
  k = 5;

var
  x: array [1..k] of integer;
  i, min_index, k2: integer;

begin
  writeln('Enter x:');
  for i := 1 to k do
  begin
    write('x[', i, '] = ');
    readln(x[i]);
  end;
 
  min_index := 1;
  k2 := 0;
  for i := 1 to k do
  begin
    if x[min_index] > x[i] then
      min_index := i;
    if x[i] mod 2 = 0 then
      k2 := k2 + 1;
  end;
 
  if k2 > 0 then
    x[min_index] := k2;
    
 
  writeln('x:');
  for i := 1 to k do
    writeln('x[', i, '] = ', x[i]);
  writeln('k2 = ', k2);
  writeln('min = ', x[min_index]);
end.

#include <iostream>
using namespace std;
typedef unsigned short int USI;

USI DigitCount(USI n) {
USI a = (int) n / 100,
bc = n % 100,
b = (int) bc / 10,
c = n % 10;
if (a > 0) return 3;
if (b > 0) return 2;
if (c > 0) return 1;
return 0;
}

USI SumDigits(USI n, USI dc) {
USI sum = 0,
a,
bc,
b,
c;
switch (dc) {
case 3:
a = (int) n / 100;
sum += a;
case 2:
bc = n % 100;
b = (int) bc / 10;
sum += b;
case 1:
c = n % 10;
sum += c;
break;
default:
return 0;
break;
}
return sum;
}

USI LastDigit(USI n) {
return n % 10;
}

USI FirstDigit(USI n, USI dc) {
switch (dc) {
case 1:
return n;
break;
case 2:
return (int) n / 10;
break;
case 3:
return (int) n / 100;
break;
default:
return 0;
break;
}
}

int main() {
USI n;
cout << "n = ";
cin >> n;
USI dc = DigitCount(n);
cout << "Число " << n
<< ":\n"
<< "Цифр: "
<< dc << '\n'
<< "Сумма цифр: "
<< SumDigits(n, dc) << '\n'
<< "Последняя цифра: "
<< LastDigit(n) << '\n'
<< "Первая цифра: "
<< FirstDigit(n, dc) << '\n';
return 0;
}