︠f0e86a33-4dc2-4743-9061-e7cc8150884ai︠
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<p># The pound sign--also known as "crunch", "hash", "number sign", or "octothorpe"--denotes a comment<br />Look at the following code. It assigns values to <em>a</em> and <em>b</em> and then their sum to <em>c</em>.</p>
<p>Note that when you press the Enter key in Sage Notebook the expression  is not evaluated. Either click "evaluate" or press Shift-Enter. Do so  now.</p>

︡c22bc1da-7511-4f1e-a1c2-06d86ae42a78︡{"html": "<p># The pound sign--also known as \"crunch\", \"hash\", \"number sign\", or \"octothorpe\"--denotes a comment<br />Look at the following code. It assigns values to <em>a</em> and <em>b</em> and then their sum to <em>c</em>.</p>\n<p>Note that when you press the Enter key in Sage Notebook the expression  is not evaluated. Either click \"evaluate\" or press Shift-Enter. Do so  now.</p>"}︡
︠daecf605-9cdd-42db-911d-aa13c7d3059b︠
a=3
b=2
c=a+b
︡87201c76-c5c2-4744-853f-a863e555a6e5︡︡
︠3b85a4cf-d31e-4c1b-a4fb-7e31890b9ac1i︠
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<p>Note that assignments are evaluated but not displayed. To display a previously defined variable, type its name on a line by itself or in a different input cell.</p>

︡d3680de8-6e47-47d3-a9c8-ed955a6c98df︡{"html": "<p>Note that assignments are evaluated but not displayed. To display a previously defined variable, type its name on a line by itself or in a different input cell.</p>"}︡
︠11360130-b1e9-414e-9a3f-c8f48efa1566︠
c
︡5bf2ef6d-46ee-4bf9-9c26-474c147ce8f2︡{"stdout": "5"}︡
︠0926b819-129b-4830-a045-5948f1d73beai︠
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<p>Like Python, changing the value of a will not change the value of c.</p>

︡71c53f2e-9080-4824-8896-fdba75d19dc7︡{"html": "<p>Like Python, changing the value of a will not change the value of c.</p>"}︡
︠b9c549d2-76de-4282-9b84-6f47a8cc7466︠
a=7
c
︡a87d2349-cc8b-49ee-a1a4-1225e2244c1b︡{"stdout": "5"}︡
︠40dfb7c0-865f-4bb5-bf15-cc000e79e6a1i︠
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<p><span style="font-size: large;"><strong>Comparison to Python</strong></span></p>
<p>1. The exponent operater. Evaluate the following cell in both Sage and Python modes. When executed in Python, 4^2=6. Python inherited the designation of '^' as the bitwise XOR operator from C/C++. For an explanation of&nbsp; bitwise XOR, see: <a href="http://irc.essex.ac.uk/www.iota-six.co.uk/c/e4_bitwise_operators_and_or_xor.asp">http://irc.essex.ac.uk/www.iota-six.co.uk/c/e4_bitwise_operators_and_or_xor.asp</a></p>

︡75728a99-e49c-4a3c-80fe-9ea29437ede8︡{"html": "<p><span style=\"font-size: large;\"><strong>Comparison to Python</strong></span></p>\n<p>1. The exponent operater. Evaluate the following cell in both Sage and Python modes. When executed in Python, 4^2=6. Python inherited the designation of '^' as the bitwise XOR operator from C/C++. For an explanation of&nbsp; bitwise XOR, see: <a href=\"http://irc.essex.ac.uk/www.iota-six.co.uk/c/e4_bitwise_operators_and_or_xor.asp\">http://irc.essex.ac.uk/www.iota-six.co.uk/c/e4_bitwise_operators_and_or_xor.asp</a></p>"}︡
︠179d920a-0e61-4ca7-b148-31cebec090b8︠
d=3**2
print 'd = ',d
e=4^2
print 'e = ',e
︡53722a27-ee66-4ffc-ae61-b0d0b8b09e54︡{"stdout": "d =  9\ne =  6"}︡
︠2235502a-2f69-4105-bfc6-4ac315c27cddi︠
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<p>2. Division with '/'. Evaluate the following cell in sage and Python</p>

︡99afef38-0ed4-4e10-a66c-474b021e9c5a︡{"html": "<p>2. Division with '/'. Evaluate the following cell in sage and Python</p>"}︡
︠eae0bfc7-a374-46ff-8ebe-1090c6cbeeee︠
d=10/5
print 'd = ',d
e=2/3
print 'e = ',e
︡4b3fd0b7-014a-4bb3-acd4-83b798798f1b︡{"stdout": "d =  2\ne =  0"}︡