Lecture 3 Notes

# 14 y 1x z 42 cosy n 15 cos is a built in

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Unformatted text preview: (x < 10) 4.  5.  6.  7.  8.  9.  10.  *, / +, - <, <=, ==, ~=, >, >= & | && || 1/30/14 •  (5 < x) && (x < 6) •  How about 5 < x && x < 6? 11 1/30/14 12 1/31/14 Variables n༆  •  How can we express 5 < x < 6? Variable: a named computer memory space for storing a value r •  (5 < x) && (x < 6) •  How about 5 < x && x < 6? n༆  n༆  Valid names start with a letter, can contain digits Use meaningful variable names! Yes, but be careful. 1/30/14 13 1/30/14 14 Assignment Assignment n༆  •  Assignment puts a value into a variable •  Assignment operator is = •  Assignment statement r = 2*4.5;! •  Result r 9.0! •  Expression on right- hand- side (rhs) evaluated before its value is assigned to variable on leY- hand- side (lhs). 1/30/14 n༆  Expression on rhs is evaluated before the assignment operation Examples: x = 2*3.14 y = 1+x z = 4^2 – cos(y) n༆  15 cos is a built-in function 1/30/14 16 Assignment n༆  n༆  Assignment Expression on rhs is evalu...
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