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  • just want to know if i am correct or not that bool is single bit can only hold 0 or 1 Commented Jul 20, 2021 at 21:25
  • @Shahreza yes, you can only store a 0 or 1 in a bool, i.e. a single bit. However, because you can't address single bits, each bool takes up a full byte, even though you can't use the other 7 buts. Commented Jul 20, 2021 at 21:58
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    Depending on the compiler's implementation, a bool can also be as wide as an int. There is no guarantee that it takes just 8 bits (chapter 8.3.3 in the C++17 standard). However, some systems support bit accesses (8051 microcontroller, for example), and some compilers for these support 1-bit bools. Commented Jul 21, 2021 at 6:48
  • A boolean test doesn't look only at bit 0 in most implementations; rather, it may look at the entire variable and test it's "zero-ness. Zero == false; non-zero == true. That still doesn't leave any values for a third distinct meaning (such as NULL). If you need that, an enum would be a better choice. Commented Jul 21, 2021 at 14:35