Char To Bit

/**
Copyright (c) 2015, ScreenBlack <screenblack at gmail dot com>
All rights reserved.

Redistribution and use in source and binary forms, with
or without modification, are permitted provided that the
following conditions are met:

1. Redistributions of source code must retain the above
copyright notice, this list of conditions and the following
disclaimer.

2. Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials
provided with the distribution.

3. Neither the name of the copyright holder nor the names of
its contributors may be used to endorse or promote products
derived from this software without specific prior written
permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
**/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

typedef struct
{
    unsigned char a:1;
    unsigned char b:1;
    unsigned char c:1;
    unsigned char d:1;
    unsigned char e:1;
    unsigned char f:1;
    unsigned char g:1;
    unsigned char h:1;
} Bits;

typedef union
{
    Bits list;
    unsigned char A;
    unsigned int Num;
} Char;

void carregaCaracter(Char *);
void carregaDecimal(Char *);
void carregaHexadecimal(Char *);
void carregaBinario(Char *);
void mostra(Char);
void menu(void);

int main(void)
{
    Char bit;
    int opcao = -1;

    while(1)
    {
        menu();
        scanf("%d%*c", &opcao);

        switch (opcao)
        {
            case 0:
                return 0;

            case 1:
                carregaBinario(&bit);
                mostra(bit);
                break;

            case 2:
                carregaDecimal(&bit);
                mostra(bit);
                break;

            case 3:
                carregaCaracter(&bit);
                mostra(bit);
                break;

            case 4:
                carregaHexadecimal(&bit);
                mostra(bit);
                break;

            default:
                printf("Opcao invalida.\nEncerrando programa");
        }
    }

    return 0;
}

void carregaCaracter(Char *bit)
{
    printf("Digite um caracter: ");
    scanf("%c%*c", &bit->A );
}

void carregaDecimal(Char *bit)
{
    printf("Digite numero decimal (max 255): ");
    scanf("%u%*c", &bit->Num );
}

void carregaHexadecimal(Char *bit)
{
    printf("Digite numero hexadecimal (max FF): ");
    scanf("%x%*c", &bit->Num);
}

void carregaBinario(Char *bit)
{
    char binario[9] = {'\0'};

    printf("Digite numero binario (8 digitos): ");
    scanf("%s%*c", binario );

    if ( binario[0] == '\0' )
        bit->list.h = 0;
    else
        bit->list.h = binario[0]-48;

    if ( binario[1] == '\0' )
        bit->list.g = 0;
    else
        bit->list.g = binario[1]-48;

    if ( binario[2] == '\0' )
        bit->list.f = 0;
    else
        bit->list.f = binario[2]-48;

    if ( binario[3] == '\0' )
        bit->list.e = 0;
    else
        bit->list.e = binario[3]-48;

    if ( binario[4] == '\0' )
        bit->list.d = 0;
    else
        bit->list.d = binario[4]-48;

    if ( binario[5] == '\0' )
        bit->list.c = 0;
    else
        bit->list.c = binario[5]-48;

    if ( binario[6] == '\0' )
        bit->list.b = 0;
    else
        bit->list.b = binario[6]-48;

    if ( binario[7] == '\0' )
        bit->list.a = 0;
    else
        bit->list.a = binario[7]-48;
}

void mostra(Char bit)
{
        printf("\n###########\nChar: %c\nDec: %d\nOctal: %o\nHexa: %X\n", bit.A, bit.A, bit.A, bit.A);
        printf("Binario: %d%d%d%d%d%d%d%d\n###########\n\n", bit.list.h, bit.list.g, bit.list.f, bit.list.e, bit.list.d, bit.list.c, bit.list.b, bit.list.a);
}

void menu(void)
{
    printf("---- Conversor NERD ----\n\n");
    printf("1 - Leitura binaria\n");
    printf("2 - Leitura decimal\n");
    printf("3 - Leitura caracter\n");
    printf("4 - Leitura hexadecimal\n\n");
    printf("0 - Encerra programa\n\n");
    printf("Opcao: ");
}