Num to Bin with BitShifting

#include <iostream>

char number[32] = {}; //Initialize as empty

void GetBinary(unsigned int input, char* output){
    memset(output, '0', 32);
    for (int i = 0; input; i++){
        output[i] = (input >> 31) + '0';
        input = input<<1;
    }
}
int main(){
    GetBinary(8, number);
    std::cout << number << std::endl;
    system("PAUSE>NUL");
}