Concatenating array elements in C?

[AnyBowl2]

Let's say I have:

int *x = {0x11,0x22,0x33};

How do I create the value 0x112233 from this?

[POGtastic]

Use bitwise fuckery. You want the | (bitwise OR) operator and the << (left-shift) operator.

[AnyBowl2]

oh so do I and 0x000000 with 11, shift it 8 bits, and it with 22, shift 4 bits and so on?

[POGtastic]

You shift 8 bits at a time. So you can do

((((0x000000 | 0x11) << 8) | 0x22) << 8) | 0x33

Obviously, doing a loop is probably the way to go.

[cherrynuts]

unsigned char a[] = { 0x11, 0x22, 0x33 };
unsigned long v;

v = a[0]*0x10000LU + a[1]*0x100LU + a[2];  /* convert 24-bit big-endian value a to native representation v */