How to set, clear, toggle and checking a single bit in C?

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Answer:

Note: Here I assume that bit of register starts with 0th position, it means the 2nd position is actually 3rd bits.

 

Setting N-th Bit

Setting an N-th bit means that if the N-th bit is 0, then set it to 1 and if it is 1 then leave it unchanged. In C, bitwise OR operator (|) use to set a bit of integral data type. As we know that | (Bitwise OR operator) evaluates a new integral value in which each bit position is 1 only when operand’s (integer type) has a 1 in that position.

In simple words, you can say that “Bitwise OR ” of two bits is always one if any one of them is one.

Algorithm to set the bits:

Clearing a Bit

Clearing a bit means that if N-th bit is 1, then clear it to 0 and if it is 0 then leave it unchanged. Bitwise AND operator (&) use to clear a bit of integral data type. “AND” of two bits is always zero if any one of them is zero.

Algorithm to clear the bit:

To clear the nth bit, first, you need to invert the string of bits then AND it with the number.

Checking a Bit

To check the nth bit, shift the ‘1’ nth position toward the left and then “AND” it with the number.

An algorithm to check the bit

Toggling a Bit

Toggling a bit means that if the N-th bit is 1, then change it to 0 and if it is 0 then change it to 1. Bitwise XOR (^) operator use to toggle the bit of an integral data type. To toggle the nth bit shift the ‘1’ nth position toward the left and “XOR” it.

An algorithm to toggle the bits

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