Integer Arithmetic
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 |
Now we try something similar using automatic type conversion offered by ColumnFixtures.
| eg.ArithmeticColumnFixture |
| x |
y |
plus() |
times() |
divide() |
floating() |
| 2 |
3 |
5 |
6 |
0 |
0.666667 |
| 0 |
0 |
0 |
0 |
error |
error |
| 0 |
0 |
0 |
0 |
n/a |
n/a |
| 200 |
300 |
500 |
60000 |
0 |
0.666667 |
| 2 |
3 |
10 |
10 |
10 |
| 200 |
3 |
5 |
6 |
0 |
0.666667 |
| 2 |
-3 |
-1 |
-6 |
-0 |
-0.666667 |
Document prepaired by Ward Cunningham
First Version July 11, 2002
Last Update August 17, 2002