C + + Note 14: C + + Extensions--new data type bool type

1. C + + adds the bool type to the basic type of C language system.

2, the bool type variable in C + + is only true and false,true represents the truth value, the compiler internally with 1, false represents a non-truth, the compiler internally with 0.

3. The C + + compiler converts a non-0 value to True (1) and a value of 0 to False (0) when the value is assigned.

4. Theoretically, the bool variable takes up one byte.

The following program describes the above:

#include <iostream>

using namespace Std;

int main ()

{

bool A = true;

cout<< "bool A" <<a<<endl; Value to verify True

cout<< "sizeof bool" <<sizeof (BOOL) <<endl;//Verify that the BOOL type variable accounts for the memory size

cout<< "sizeof a" <<sizeof (a) <<endl; Verify that the BOOL type variable accounts for memory size

BOOL B = false;

cout<< "bool B" <<b<<endl; Value to verify False

BOOL C = 0;

cout<< "bool C" <<c<<endl; Verify that the value of the BOOL variable value is 0

bool d = 10;

cout<< "BOOL D" <<d<<endl; Verify that the bool variable value is a value other than 0

BOOL E =-10;

cout<< "bool E" <<e<<endl; Verify that the bool variable value is a value other than 0

System ("pause");

return 0;

}

Operation Result:

BOOL a 1

sizeof BOOL 1

sizeof a 1

BOOL B 0

BOOL C 0

BOOL D 1

BOOL E 1

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C + + Note 14: C + + Extensions--new data type bool type