OR-2005-Ubaci5

#include <stdio.h>
#include <string.h>

int ubaci5 (int n, int a, int b) {
    int nb=0, k=1, i=1, cifra;
    while (n!=0) {
            cifra=n%10;
    if (i==a || i==b) nb+=5*k;
    else nb+=cifra*k;
    k*=10;
    n/=10;
    i++;
    }
    return nb;
}
int main () {
    printf("%d", ubaci5(23455,3,5));
    return 0;
}