tot probelma

#include <stdio.h>
#include <stdlib.h>
unsigned short  st[11], varf;

void push(unsigned short x) {
    if (varf > 9) return;
    st[++varf] = x;


}

void pop() {
    if (varf == 0) return;
    unsigned short copie = st[varf], nrBit = 0;
    while (copie) {
        nrBit++;
        copie &= copie - 1;
    }
    copie = st[varf];
    printf("pop %ld\n", st[varf]);
    printf("Numarul de biti = 1: %hd\n", nrBit);
    copie &= ~(1 << 2);
    printf("Numarul dupa mascarea bitului 2: %hd\n", copie);
    st[varf] &= ~(1 << 6);
    printf("Numarul dupa bitul 6 devine 0: %hd\n\n", st[varf]);
    varf--;
}

int main(){
    unsigned short x, i;
    for (i = 1; i < 8; i++) {
        printf("st[%d]= ", i);
        scanf("%hd", &x);
        push(x);
    }
    for (i = 1; i < 8; i++)pop();




    return 0;

}