What Is bool data type?

Answer 1

There are a number of data types that we use in computer science. Bool data type stands for boolean data type. In boolean data type the data is stored in form of 0 ans 1s. On boolean data type logical functions like AND, OR ,NOT ,XOR etc functions can be performed.

Answer 2

A bool data type is a variable that is interpreted as being true if its value is non-zero, and false if it is zero. Although it only has two possible states and can conceivably occupy just 1 bit, it actually uses 8 bits and is effectively the same as a signed char. The value 0x00 (0) is always false while 0xFF (-1) is typically true but any non-zero value is regarded as being true.

For a single boolean, 8-bits is fine, but if you have several boolean values it can be more efficient to use a bitmap where each bit represents a separate boolean value. Thus a 32-bit int can store a bitmap containing up to 32 boolean values. Using the standard bool would require up to 32 bytes, which quickly adds up if you have many objects with many bools.

To determine the state of individual bits in a boolean bitmap you use the bitwise AND operator (&) to compare the bitmap with individual hex values 0x1, 0x2, 0x4, 0x8, 0x10, 0x20, 0x40 and so on, for each bit from the right. Thus to check the forth bit from the right, you return the evaluation of bitmap & 0x8. If the result is zero, the bit is not set. If the result is 0x8 (or simply non-zero), then the bit is set.

You can also check for multiple values by bitwise ORing the individual values. Thus bitmap & ( 0x01 | 0x02) returns 0x00 if neither of the first two bits are set, 0x01 if the first bit is set, 0x02 if the second is set and 0x03 if both are set.

Answer 3

Boolean data is either 0 or 1. You can perform logical operations such as AND, OR and NOT on this data type.