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
Traceback (most recent call last):
  File "../fit/fit/Fixture.py", line 56, in doCells
    self.doCell(cells, i)
  File "/home/simon/fit/python-Source/eg/ArithmeticFixture.py", line 23, in doCell
    elif column == 5: self.check(cell, self.x/self.y)
ZeroDivisionError: integer division or modulo by zero
1 2 3 -1 2 0.5 expected
0 actual
1 -1 0 2 -1 -1
10000 10000 20000 0 100000000 1
100000 100000 200000 0 10000000000
Traceback (most recent call last):
  File "../fit/fit/Fixture.py", line 56, in doCells
    self.doCell(cells, i)
  File "/home/simon/fit/python-Source/eg/ArithmeticFixture.py", line 22, in doCell
    elif column == 4: self.check(cell, self.x*self.y)
OverflowError: integer multiplication
1
Traceback (most recent call last):
  File "../fit/fit/Fixture.py", line 56, in doCells
    self.doCell(cells, i)
  File "/home/simon/fit/python-Source/eg/ArithmeticFixture.py", line 22, in doCell
    elif column == 4: self.check(cell, self.x*self.y)
OverflowError: integer multiplication
1000000 1000000 2000000 0 1000000000000
Traceback (most recent call last):
  File "../fit/fit/Fixture.py", line 56, in doCells
    self.doCell(cells, i)
  File "/home/simon/fit/python-Source/eg/ArithmeticFixture.py", line 22, in doCell
    elif column == 4: self.check(cell, self.x*self.y)
OverflowError: integer multiplication
1
Traceback (most recent call last):
  File "../fit/fit/Fixture.py", line 56, in doCells
    self.doCell(cells, i)
  File "/home/simon/fit/python-Source/eg/ArithmeticFixture.py", line 22, in doCell
    elif column == 4: self.check(cell, self.x*self.y)
OverflowError: integer multiplication


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 expected
0.66666666666666663 actual
0 0 0 0 error error
0 0 0 0
200 300 500 60000 0 0.666667 expected
0.66666666666666663 actual
2 3 10 expected
5 actual		 10 expected
6 actual		 10 expected
0 actual
200 3 5 expected
203 actual		 6 expected
600 actual		 0 expected
66 actual		 0.666667 expected
66.666666666666671 actual
2 -3 -1 -6 -0 expected
-1 actual		 -0.666667 expected
-0.66666666666666663 actual


fit.Summary
input file /usr/local/src/fit/python-Source/Documents/arithmetic.html
input update Fri Oct 4 22:51:02 2002
counts 32 right, 12 wrong, 0 ignored, 5 exceptions
run date Sun Oct 6 19:50:51 2002
output file /usr/local/src/fit/python-Source/Reports/arithmetic.html

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