Целые числа - C++

#include <stdio.h>
 
short numberpos(unsigned short arr[], short nm)
{
    int suma = 0;
    for(int m = 0; m < nm; m++) {
        suma += arr[m];
    }
 
    return suma;
}
 
int main(int argc, char * argv [])
{
    const short N = 9;
    unsigned short mas[N], nz[3], nn[3], i = 0;
 
    for(short s = 0; s < N; s++) {
        printf("Number[%d]: ", s + 1);
        if(scanf_s("%d", & mas[s]) == 0) {
            fprintf(stderr, "Error!\n");
            return -1;
        }
 
        if((mas[s] == 0)&&(i <= 2)) {
            nz[i] = mas[s]; nn[i] = s;
            i++;
        }
    }
 
    int yn = nz[0] == nz[1] ? (nz[1] == nz[2] ? 
        printf("Numbers: %d %d %d\n", nn[0], nn[1], nn[2]) 
        : printf("Suma: %d\n", numberpos(mas, N))) 
        : printf("Suma: %d\n", numberpos(mas, N));
 
    return 0;
}