Calculate Sum of Digits: C Program

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Lets ask the user to input a integer number through keyboard. Lets write a c program to calculate sum of its digits.
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[@gugunkhongsai13]

Thanks so much it's easy only when you look it😂

[@user-zo8wy8be1f]

i really don't understand the logic between sum

[@builder481]

it's not working

[@builder481]

int main(void)
{
int credit_card, reminder, count = 0;
credit_card = get_long("Enter Number
");
while (credit_card != 0)
{
reminder = credit_card % 10;
count = count + reminder;
credit_card = credit_card / 10;
}
printf("%d
", count);
}
enter number : 555555555555
OUTPUT :
39