Logical operators. : bool « Data Types « C++ Tutorial






  1. C++ Tutorial
  2. Data Types
  3. bool
#include <iostream>
using std::cout;
using std::endl;
using std::boolalpha; // causes bool values to print as "true" or "false"

int main()
{
   // create truth table for && (logical AND) operator
   cout << boolalpha << "Logical AND (&&)"
      << "\nfalse && false: " << ( false && false )
      << "\nfalse && true: " << ( false && true )
      << "\ntrue && false: " << ( true && false )
      << "\ntrue && true: " << ( true && true ) << "\n\n";

   // create truth table for || (logical OR) operator
   cout << "Logical OR (||)"
      << "\nfalse || false: " << ( false || false )
      << "\nfalse || true: " << ( false || true )
      << "\ntrue || false: " << ( true || false )
      << "\ntrue || true: " << ( true || true ) << "\n\n";

   // create truth table for ! (logical negation) operator
   cout << "Logical NOT (!)"
      << "\n!false: " << ( !false )
      << "\n!true: " << ( !true ) << endl;
   return 0;
}

Logical AND (&&)
false && false: false
false && true: false
true && false: false
true && true: true

Logical OR (||)
false || false: false
false || true: true
true || false: true
true || true: true

Logical NOT (!)
!false: true
!true: false




2.6.bool
2.6.1.bool values
2.6.2.A bool value can control the if statement
2.6.3.Outcome of a relational operator is a true/false value
2.6.4.Variable size of bool
2.6.5.The || Operator
2.6.6.The !(Exclamation mark) Operator
2.6.7.The && Operator (amplifier)
2.6.8.Output boolean variable as boolean literal or number
2.6.9.Use bool value to control a while loop
2.6.10.Logical operators.