program SumOfDigits;
vanum, sum, digit: integer;
begisum := 0;
writeln('Enter a four-digit natural number:')readln(num);
// Calculate the sum of digitdigit := num mod 10sum := sum + digitnum := num div 10;
digit := num mod 10sum := sum + digitnum := num div 10;
digit := num mod 10sum := sum + digit;
writeln('The sum of digits is: ', sum);
end.
program SumOfDigits;
va
num, sum, digit: integer;
begi
sum := 0;
writeln('Enter a four-digit natural number:')
readln(num);
// Calculate the sum of digit
digit := num mod 10
sum := sum + digit
num := num div 10;
digit := num mod 10
sum := sum + digit
num := num div 10;
digit := num mod 10
sum := sum + digit
num := num div 10;
digit := num mod 10
sum := sum + digit;
writeln('The sum of digits is: ', sum);
end.