#include <stdio.h>
int countZeros(int n) {
int count = 0;
while (n % 10 == 0) {
count++;
n /= 10;
}
return count;
}
int main(void) {
printf("%d\n", countZeros
(123000)); printf("%d\n", countZeros
(102030)); }
//https://pt.stackoverflow.com/q/112972/101
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