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- #include <stdio.h>
- int main() {
- long long n;
- int count = 0;
- printf("Enter an integer: ");
- scanf("%lld", &n);
- // iterate at least once, then until n becomes 0
- // remove last digit from n in each iteration
- // increase count by 1 in each iteration
- do {
- n /= 10;
- ++count;
- } while (n != 0);
- printf("Number of digits: %d", count);
- }
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