The computer relies on arithmetic. Here we test a variety of arithmetic
operations expressed as 32 bit two's complement binary numbers (Java's
int).
| eg.ArithmeticFixture | |||||
| x | y | + | - | * | / |
| 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 2 | 3 | -1 | 2 | 0.5 |
| 1 | -1 | 0 | 2 | -1 | -1 |
| 10000 | 10000 | 20000 | 0 | 100000000 | 1 |
| 100000 | 100000 | 200000 | 0 | 10000000000 | 1 |
| 1000000 | 1000000 | 2000000 | 0 | 1000000000000 | 1 |
switch( $node->key() ) {
case 0:
$this->x = intval( $node->cData );
break;
case 1:
$this->y = intval( $node->cData );
break;
case 2:
$this->_checkCell( $node, $this->x + $this->y ); break;
break;
case 3:
$this->_checkCell( $node, $this->x - $this->y ); break;
break;
case 4:
$this->_checkCell( $node, $this->x * $this->y ); break;
break;
case 5:
if( $this->y == 0 ) {
throw new Exception( 'ArithmeticException: / by zero' );
}
$this->_checkCell( $node, $this->x / $this->y ); break;
break;
default:
break;
}
Document prepaired by Ward Cunningham
First Version July 11, 2002
Last Update August 17, 2002