Lab Pregunta 1 Complemento de Binarios

//gcc 5.4.0

#include  <stdio.h>
#include  <math.h>
#define  MAX 16

int main(void)
{
    long int cantNum, num, auxnum, i=0,j=0,k=0,flag=0;
    int bits[MAX]={};

    do{
    scanf("%ld",&cantNum);
    }while((cantNum < 1) || (cantNum > 100));

    for(i=0; i < cantNum; i++){

        flag = 0;

        do{
        scanf("%ld",&num);
        }while((num < -32768) || (num > 32767));

        for(j=0; j < MAX; j++){
            bits[j]=0;
        }

        auxnum = num;
        k= (MAX - 1);

        while(num != 0){
            bits[k] = num % 2;
            k--;
            num = num / 2;
        }

        for(j=0; j < MAX; j++){
            //printf("%d",bits[j]);
            if(bits[j] < 0){
                bits[j] = (-1 * bits[j]);
                flag = 1;
            }
        }


        if(flag == 0){

            printf("%ld en C2 = ",auxnum);

            for(j=0; j < MAX; j++){
                printf("%d",bits[j]);
            }
        }else{

            //Obtener el Complemento 1
            for(j=0; j < MAX; j++){
                flag = 0;
                if((bits[j] == 0)&&(flag==0)){
                    bits[j] = 1;
                    flag = 1;
                }
                if((bits[j] == 1)&&(flag==0)){
                    bits[j] = 0;
                    flag = 0;
                }
            }

            flag = 0;
            //Obtener el Complemento 2
            printf("%ld en C2 = ",auxnum);
            for(j=MAX-1; j >= 0; j--){

                if(j == (MAX-1)){

                    if(bits[j] == 1){
                        bits[j] = 0;
                        flag = 1;
                    }
                    if((bits[j] == 0)&&(flag == 0)){
                        bits[j] = 1;
                        flag = 0 ;
                    }
                }

                if(j < (MAX - 1)){

                    if((bits[j] == 0)&&(flag == 1)){
                        bits[j] = 1;
                        flag = 0;
                    }

                    if((bits[j] == 1)&&(flag == 1)){
                        bits[j] = 0;
                        flag = 1;
                    }
                }
            }
            for(j=0; j < MAX; j++){
                printf("%d",bits[j]);
            }
            }
                    printf("\n");
        }

    return 0;
}