Bit Set
How do I check if a bit is set in C?
For example, I have a variable
int bits;
bits can be one of several values, eg
bits = BIT_1;
bits = BIT_2;
bits = BIT_1|BIT_2;
bits = BIT_1|BIT_3;
etc.
So first of all, how do I check if bits contains BIT_1? Or BIT_2? When it doesn’t matter if the other bits are on or off? And second, what is the value of bits when no bits are set? NULL? This is in C not C++
.The default value for an int is 0. Without giving it any other value, it will be zero.
Test the existence of a bit using the bitwise AND (&) operator.
if(bits&BIT_1) {
//then bits contains BITS_1
}
Ryan Reynolds Rage on Set of The Proposal
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Tags: bit, bit set, bit setting, bitset c++, bitset in c, bitset java, c#, drill, programming, set
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