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).

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.

ArithmeticColumnFixture

x y plus() times() divide()

2 3 5 6 0.666667

200 300 500 60000 0.666667

2 3 10 10 10

200 3 5 6 0.666667

2 -3 -1 -6 -0.666667

Summary

Document prepaired by Ward Cunningham
First Version July 11, 2002
Last Update August 17, 2002

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

ArithmeticColumnFixture
x	y	plus()	times()	divide()
2	3	5	6	0.666667
200	300	500	60000	0.666667
2	3	10	10	10
200	3	5	6	0.666667
2	-3	-1	-6	-0.666667