Setting the bit at poistion n in an `int` variable

Setting a bit

Recall: how to set a bit

Bit position: 6543210 Starting bit pattern: ..............x............... Bit mask: 000000000000001000000000000000 ----------------------------------------- OR ..............1............... (Bit dnoted by . will remain unchaned)

Making the bit mask

The bit mask 00000000000010000000000000... canbe made with the following operation:

i positions <--------------> 1 << i = 000000..1000000000000000

C statement to set bit position i in an int variable

C code:

int x; int i; x = x | (1 << i ); // Set bit position i in x

Macro definition for setbit operation

C macro to set bit at position i in a variable x:

#define SETBIT( x, i ) ( x |= (1 << i) )

Setting the bit at poistion n in an int variable

Setting the bit at poistion n in an `int` variable