int sign = (float)dividend / divisor > 0 ? 1 : -1;

unsigned int dvd = dividend > 0 ? dividend : -dividend;

unsigned int dvs = divisor > 0 ? divisor : -divisor;

unsigned int bit_num[32];

unsigned int i=0;

long long d = dvs;

bit_num[i] = d;

while( d <= dvd ){

bit_num[++i] = d = d << 1;

}

i--;

unsigned int result = 0;

while(dvd >= dvs){

if (dvd >= bit_num[i]){

dvd -= bit_num[i];

result += (1<<i);

}else{

i--;

}

}

//becasue need to return `int`, so we need to check it is overflowed or not.

if ( result > INT_MAX && sign > 0 ) {

return INT_MAX;

}

return (int)result * sign;

{

cout << "0/2=" << divide(0, 2) << endl;

cout << "10/2=" << divide(10, 2) << endl;

cout << "10/3=" << divide(10, 3) << endl;

cout << "10/5=" << divide(10, 5) << endl;

cout << "10/7=" << divide(10, 7) << endl;

cout << "10/10=" << divide(10, 10) << endl;

cout << "10/11=" << divide(10, 11) << endl;

cout << "-1/1=" << divide(1, -1) << endl;

cout << "1/-1=" << divide(1, -1) << endl;

cout << "-1/-1=" << divide(-1, -1) << endl;

cout << "2147483647/1=" << divide(2147483647, 1) << endl;

cout << "-2147483647/1=" << divide(-2147483647, 1) << endl;

cout << "2147483647/-1=" << divide(2147483647, -1) << endl;

cout << "-2147483647/-1=" << divide(-2147483647, -1) << endl;

cout << "2147483647/2=" << divide(2147483647, 2) << endl;

cout << "2147483647/10=" << divide(2147483647, 10) << endl;

cout << "-2147483648/1=" << divide(-2147483648, 1) << endl;

cout << "-2147483648/-1=" << divide(-2147483648, -1) << endl;