Write a file in c of an array of integers with fputc

Question

I\'m writing a program that reads a file and generates an array of integers of each byte, first I prove with a .txt file and I generates the ASCII for each of the letters an

Answer 1

You should reconstruct the integer starting from your array using your mask array.

#include

int main(void)
{

    int b1, b2, b3, b4, b5, b6, b7, b8;
    int x, i;
    char a, b;

    FILE *f1, *bin, *fp;

    b1 = 0x01; // = 0000 0001
    b2 = 0x02; // = 0000 0010
    b3 = 0x04; // = 0000 0100
    b4 = 0x08; // = 0000 1000
    b5 = 0x10; // = 0001 0000
    b6 = 0x20; // = 0010 0000
    b7 = 0x40; // = 0100 0000
    b8 = 0x80; // = 1000 0000

    int mask[8] = { b8, b7, b6, b5, b4, b3, b2, b1 };
    int rest[8];

    f1 = fopen("UAM.txt", "rb");
    fp = fopen("file.txt", "w+");

    while ((a = fgetc(f1)) != EOF)
    {
        printf("%d\n", a);

        for (i = 0; i <= 7; i++)
        {
            rest[i] = a & mask[i];
        }

        for (i = 0; i <= 7; i++)
        {
            rest[i] = rest[i] / mask[i];
        }

        a=0;
        for (x = 0; x <= 7; x++)
        {
            printf("%i", rest[x]);
            a += rest[x] * mask[x];
        }

        printf("\n%d\n", a);

        fputc(rest[x], fp);

        printf("\n");
    }

    fclose(f1);
    fclose(fp);

    return 0;
}

A better approach could be

#include

int main(void)
{

    int x, i;
    char a;

    FILE *f1, *fp;

    int rest[8];

    f1 = fopen("UAM.txt", "rb");
    if ( f1 != NULL)
    {
        fp = fopen("file.txt", "w+");

        if ( fp != NULL)
        {
            while ((a = fgetc(f1)) != EOF)
            {
                printf("%d\n", a);

                for (i = 0; i < 8; i++)
                {
                    rest[i] = a & 0x01;

                    a>>=1;
                }

                a=0;
                for (x = 7; x >= 0; x--)
                {
                    printf("%i", rest[x]);

                    a += ((0x01u << x) * rest[x]);
                }

                fputc(rest[x], fp);

                printf("\n");
            }

            fclose(fp);
        }

        fclose(f1);
    }

    return 0;
}