Question

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Print an int in binary representation using C

How would I print the byte representations of a short int, and double in C.

As in lets say I have a function display_shortInt, how would I make it print the byte representation of a short int? I’m new to C, thanks you!

Answer 1

What about this?

void print_bytes(void *p, size_t len)
{
    size_t i;
    printf("(");
    for (i = 0; i < len; ++i)
        printf("%02X", ((unsigned char*)p)[i]);
    printf(")");
}

void print_short(short x)
{
    print_bytes(&x, sizeof(x));
}

void print_double(double x)
{
    print_bytes(&x, sizeof(x));
}
//etc.

That will print the bytes that form the value, in hexadecimal, two characters per byte.

For example, in a little-endian machine, print_short(42) will print (2A00). In a big-endian machine it will be (002A).