/****************************************************************************
  Implements the Boolean function F = ab' + bc'd'
****************************************************************************/ 
 
#include <Sim.h>                       // Interface to the "sim" package
 
void simnet()                          // Function must be named "simnet"
{
  Signal a, b, c, d, F;                // Switch and output objects 
 
  Signal notb, notc, notd;
  Signal and1, and2;                   // Intermediate objects 
 
  // Components and interconnections
 
  Switch ( SD("1a"), a, 'a' );         // Switch a controlled by 'a' key
  Switch ( SD("2a"), b, 'b' );         // Switch b controlled by 'b' key
  Switch ( SD("3a"), c, 'c' );         // Switch c controlled by 'c' key
  Switch ( SD("4a"), d, 'd' );         // Switch d controlled by 'd' key
 
  Not ( SD("2b"), b, notb );           // NOT gates
  Not ( SD("3b"), c, notc );
  Not ( SD("4b"), d, notd );
 
  And ( SD("2c"), (a, notb), and1 );   // AND gates                                      
  And ( SD("3c"), (b, notc, notd), and2 );    
 
  Or ( SD("2d"), (and1, and2), F );    // OR gate
 
  Probe ( (SD("2e"), "F"), F );        // Probe
}