И объясните как это делать,я не понимаю

#include <iostream>
#include <string>
using namespace std;

string arabicToRoman(unsigned &number)
{
const unsigned count = 13;unsigned arabic[count] = { 1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1
}, i, j;
string roman[count] = { "M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX",
"V", "IV", "I" }, result = "";
for (i = 0; i < count; i++) {
for (j = 0; j < number / arabic[i]; j++) {
result += roman[i];
}
number %= arabic[i];
}
return result;
}

int main()
{
unsigned uin = 0;
cin >> uin;
cout << arabicToRoman(uin);
system("pause");
return 0;
}

Program N70231806_1;
var a:array[ 1 .. 10 ] of shortint;
i:byte;
t:shortint;
begin
randomize;
writeln('Исходный массив: ');
for i := 1 to 10 do
begin
a[ i ] := random(21) - 10;
write(a[ i ]:4)
end;
writeln;
t := a[ 10 ];
for i := 10 downto 2 do
a[ i ] := a[ i - 1 ];
a[ 1 ] := t;
writeln('Результат: ');
for i := 1 to 10 do
write(a[ i ]:4);
readln
end.

2)
program N70231806_2;
var a:array[ 1 .. 12 ] of shortint;
i, j:byte;
t:shortint;
begin
randomize;
writeln('Исходный массив: ');
for i := 1 to 12 do
begin
a[ i ] := random(25) - 10;
write(a[ i ]:4)
end;
writeln;
for j := 1 to 4 do
begin
t := a[ 12 ];
for i := 12 downto 2 do
a[ i ] := a[ i - 1 ];
a[ 1 ] := t
end;
writeln('Результат: ');
for i := 1 to 12 do
write(a[ i ]:4);
readln
end.