write('Enter a four-digit number: ') readln(number);
if (number < 1000) or (number > 9999) the begi writeln('Please enter a valid four-digit number.') en els begi digit := number mod 10 sum := sum + digit number := number div 10;
digit := number mod 10 sum := sum + digit number := number div 10 digit := number mod 10 sum := sum + digit number := number div 10 digit := number mod 10 sum := sum + digit writeln('Sum of digits: ', sum);
program SumOfDigits;
va
number, sum, digit: integer;
begi
sum := 0;
write('Enter a four-digit number: ')
readln(number);
if (number < 1000) or (number > 9999) the
digit := number mod 10begi
writeln('Please enter a valid four-digit number.')
en
els
begi
digit := number mod 10
sum := sum + digit
number := number div 10;
sum := sum + digit
number := number div 10
digit := number mod 10
sum := sum + digit
number := number div 10
digit := number mod 10
sum := sum + digit
writeln('Sum of digits: ', sum);
end
end.