void testswitch1( int a, int* b, int c)
{
  switch (a) {
  case 0: 
    *b = 0;	break;
  case 1: 
    if ( c > 100 ) *b = 0; 
    else  *b = 3; 
    break;
  case 2: 	
    *b = 1; break;
  case 3:   break;
  case 4:   *b = 2; break;
  }
}

int testswitch2(int a)
{
  int r=15;

  switch (a<20) {
  case 1: 
	r=10;
  }
  return(r);
}

void testswitch3( int a, int* b, int c)
{
  switch (a) {
  case 0: 
    *b = 0;	break;
  case 5: 
    if ( c > 100 ) *b = 0; 
    else  *b = 3; 
    break;
  case 2: 	
    *b = 1; break;
  case 13:   break;
  case 4:   *b = 2; break;
  }
}

int main(void) {

int res, a=16, *b;

testswitch1( 1 , b, 15);
res = testswitch2(a);
testswitch3( 4 , b, 15);
return(0);
}