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C - Logical Operators Examples

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Try following example to understand all the Logical operators. Copy and paste following C program in test.c file and compile and run this program.

main()
{
   int a = 21;
   int b = 10;
   int c ;

   if( a == b )
   {
      printf("Line 1 - a is equal to b\n" );
   }
   else
   {
      printf("Line 1 - a is not equal to b\n" );
   }
   if ( a < b )
   {
      printf("Line 2 - a is less than b\n" );
   }
   else
   {
      printf("Line 2 - a is not less than b\n" );
   }
   if ( a > b )
   {
      printf("Line 3 - a is greater than b\n" );
   }
   else
   {
      printf("Line 3 - a is not greater than b\n" );
   }
   /* Lets change value of a and b */
   a = 5;
   b = 20;
   if ( a <= b )
   {
      printf("Line 4 - a is either less than or euqal to  b\n" );
   }
   if ( b >= a )
   {
      printf("Line 5 - b is either greater than  or equal to b\n" );
   }
   if ( a && b )
   {
      printf("Line 6 - Condition is true\n" );
   }
   if ( a || b )
   {
      printf("Line 7 - Condition is true\n" );
   }
   /* Again lets change the value of  a and b */
   a = 0;
   b = 10;
   if ( a && b )
   {
      printf("Line 8 - Condition is true\n" );
   }
   else
   {
      printf("Line 8 - Condition is not true\n" );
   }
   if ( !(a && b) )
   {
      printf("Line 9 - Condition is true\n" );
   }
}

This will produce following result


Line 1 - a is not equal to b
Line 2 - a is not less than b
Line 3 - a is greater than b
Line 4 - a is either less than or euqal to  b
Line 5 - b is either greater than  or equal to b
Line 6 - Condition is true
Line 7 - Condition is true
Line 8 - Condition is not true
Line 9 - Condition is true

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