C++ LANGUAGE LOGICAL OPERATORS PAGE 42

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C++ LANGUAGE LOGICAL OPERATORS

 
 
Logical Operators 


There are following logical operators supported by C++ language. 
Assume variable A holds 1 and variable B holds 0, then:




Operator  Description               Example 
&&      Called Logical AND operator. 
            If both the operands are 
            non-zero, then condition 
            becomes true.             (A && B) is false. 
||      Called Logical OR Operator. 
            If any of the two operands 
            is non-zero, then condition 
            becomes true.             (A || B) is true. 
!      Called Logical NOT Operator. 
            Use to reverses the logical 
            state of its operand. If a 
            condition is true, then 
            Logical NOT operator will 
            make false.            !(A && B) is true. 


Try the following example to understand all the logical operators available in C++. 
Copy and paste the following C++ program in test.cpp file and compile and run this program. 
#include <iostream> 
using namespace std; 
 
main() 
{ 
   int a = 5; 
   int b = 20; 
   int c ; 
 
   if ( a && b ) 
   { 
      cout << "Line 1 - Condition is true"<< endl ; 
   } 
   if ( a || b ) 
   { 
      cout << "Line 2 - Condition is true"<< endl ; 
   } 
   /* Let's change the values of  a and b */ 
   a = 0; 
   b = 10; 
   if ( a && b ) 
   { 
      cout << "Line 3 - Condition is true"<< endl ; 
   } 
   else 
   { 
      cout << "Line 4 - Condition is not true"<< endl ; 
   } 
   if ( !(a && b) ) 
   { 
      cout << "Line 5 - Condition is true"<< endl ; 
   } 
   return 0; 
} 
When the above code is compiled and executed, it produces the following result: 
Line 1 - Condition is true 
Line 2 - Condition is true 
Line 4 - Condition is not true 
Line 5 - Condition is true