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Message: [QUOTE="noone, post: 2554260"] "first four bits" is ambiguous...and depends upon whether your system is big or little endian...and as everyone knows, little endian machines suck! but, to answer your question, shift left increases the value by a power of two and shift right decreases by a power of two....so, to extract bit fields out of a number with bits numbers 2^n n=[0..15] use bits1to3=(x>>1)&0x0f; // bits 1 2 3 4 bits12to15=(x>>12)&0x0f; // bits 12 13 14 15 to extract bit fields you should shift right then use a bit mask containing all ones. [/QUOTE]