In this C++ program, a variable of type boolean
is declared and initialized with the value false
. The “!” character in front of a boolean variable inverts the expression. The if
statement checks whether the variable isSet
is false
. If such a case should arise, the variable is set to true
.
The code initializes a boolean variable isSet
to false
, and then checks if isSet
is false
using an if
statement with a negation operator !
. If isSet
is indeed false
, the code sets its value to true
using an assignment operator =
.
Finally, the code prints the string “true” to the console if isSet
is equal to 1
(which is equivalent to true
), and “false” otherwise. This is done using the ternary operator ? :
, which is a shorthand for an if
–else
statement. The ternary operator has the form condition ? value_if_true : value_if_false
, and returns value_if_true
if condition
is true, and value_if_false
otherwise. In this case, the condition is (isSet == 1)
which evaluates to true if isSet
is equal to 1
, and value_if_true
is the string “true”, while value_if_false
is the string “false”.
#include <iostream>
using namespace std;
int main() {
bool isSet = false;
if (!isSet)
isSet = true;
cout << (isSet == 1 ? "true" : "false");
return 0;
}
true