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cs31 lecture 17

Of a value example foo x examples int foo 42 18

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Unformatted text preview: o + 1; foo = foo + 1 bar = ++foo + 1 is equivalent to foo = foo + 1; bar = foo + 1 x -- to decrement by 1 and assign the result to the variable Example: foo-- or --foo x - to take the opposite of a value Example: -foo x Examples: int foo = 42; 18 Summary x A variable must be declared before it is used x Declarations can occur (almost)
 anywhere in the program x Good habit: put all declarations at the beginning x Each instruction ends by ; x Good habit: one instruction per line x Variable names are case-sensitive x Assignment of value can be done at declaration x Be careful to the variable type! 19 Mixing types x What about using floats and ints in the same expression? Example: foo = 12 + 24.2; x The type of the expression depends on the type of the The <lhs> <lhs> Example: int foo = 12 + 24.2; // foo has value 36 float foo = 12 + 24.2; // foo has value 36.2 x Be careful: floats are truncated to int, not rounded Example: int foo = 12 + 24.9; // foo has value 36 20 Integer division x Be careful: if division is used on integer data (variable or Be value)
, then integer division is used value)
, x Example:...
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