IBCHNG

 IBCHNG (integer, position)

 Class:  Elemental function - Generic

 Returns the reverse of the value of a specified bit in an integer.
 The low-order bit is position 0.

 Examples:

 Consider the following:

   INTEGER J, K
   J = IBCHNG(10, 2)         ! returns 14 = 1110
   K = IBCHNG(10, 1)         ! returns  8 = 1000