52. [Bool type input any non-0 value is not 1 version reason]

[visual studio 2022 version]

[that is, the bool type is not assigned an initial value]

#include

using namespace std;

int main()

{

bool x;

cout << "Please enter the bool value manually:" << endl;

cin >> x;

cout << "The result is:" << x << endl;

return 0;

}

==========================

[The initial value of bool is assigned]

#include

using namespace std;

int main()

{

bool x=false;

cout << "Please enter the bool value manually:" << endl;

cin >> x;

cout << "The result is:" <

return 0;

}

=================================

[visual studio 2015 version]

[That is, the bool type is not assigned an initial value]

#include

using namespace std;

int main()

{

bool x;

cout << "Please enter the bool value manually:" << endl;

cin >> x;

cout << "The result is:" << x << endl;

return 0;

}

========================

[When bool is assigned an initial value (will become false)]

#include

using namespace std;

int main()

{

bool x=false;

cout << "Please enter the bool value manually:" << endl;

cin >> x;

cout << "The result is:" <

return 0;

}

Why is this happening?

Because when the bool type variable is assigned through cin, if the input is "non-0, non-1", the variable value does not change.That is, the bool type variable can only be assigned 0 or 1 through cin, and the others are invalid.

How to change it?

Generally, it is judged by setting the intermediate quantity, and then indirectly assigning the bool variable.Regardless of whether x is defined or not, the bool type variable x is forcibly assigned through the int type variable a, which effectively solves the above problems.

========================

[Forced assignment]

#include
using namespace std;
int main()
{
bool x=false;
cout << "Please enter the bool value manually:" << endl;
int a;
cin >> a;
x = a;
cout << "The result is:" < return 0;

}