int main(){
uint32_t b = 159506;
int cnt=0;
bool chet=1;

for(int i=0; i<sizeof(b)*8; i++)
    if(b & (1ul<<i)) cnt++;
if (cnt & 1) chet=0;
printf("Единиц %d\n",cnt);
printf("Четность %d\n",chet);

}

cc1plus: warnings being treated as errors
In function 'int main()':
Line 6: warning: comparison between signed and unsigned integer expressions