INT_ADD_SUB:
  Input I1 = 42.
  Input I2 = 22.
  Output I3 = 64.

REAL_ADD_SUB:
  Input R1 = 42.
  Input R2 = 22.
  Output R3 = 64.

DOUBLE_ADD_SUB:
  Input R1 = 42.
  Input R2 = 22.
  Output R3 = 64.
 
EX2
  FORTRAN90 main program
 
  Demonstrate how a FORTRAN program 
  can call a C++ routine.
 
  Set the value of two integers I1 and I2.
  Call a C++ routine to compute I1 + I2.
 
  Input I1 =     42
  Input I2 =     22
  INT_ADD_SUB  returns I3 =     64
  INT_ADD_FUNC returns I4 =     64
 
  Set the value of two reals R1 and R2.
  Call a C++ routine to compute R1 + R2.
 
  Input R1 =    42.0000    
  Input R2 =    22.0000    
  REAL_ADD_SUB  returns R3 =    64.0000    
  REAL_ADD_FUNC returns R4 =    64.0000    
 
  Set the value of two double precision values D1 and D2.
  call a C++ routine to compute D1 + D2.
 
  Input D1 =    42.0000    
  Input D2 =    22.0000    
  DOUBLE_ADD_SUB  returns output D3 =    64.0000    
  DOUBLE_ADD_FUNC returns output D4 =    64.0000    
 
EX2:
  Normal end of execution.