Algorithms Operators.ppt

Algorithms Operators.ppt - cosc175/operators 1 Algorithms...

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cosc175/operators 1 Algorithms computer as the tool process – algorithm Receive and put out information - i/o Arithmetic: addition,subtraction,multiplication,division Save information for future use Comparison Repeat any group of operations

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cosc175/operators 2 Assignment operator = Value assigning differs from equality x = 3 vs if (x == 3) variable = expression;
variable = expression variable -physical location in computer memory expression Constant x = 10; x = PI; Another variable to which a value has previously been assigned y = x; A formula to be evaluated y = (x*4) /2 ; cosc175/operators 3

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cosc175/operators 4 Assignment Processor evaluates the right member of an assignment statement to get a single value It places this value in the memory location (variable name) given as the left member. Not a mathematical equation , can't be switched stamp = 14 is a valid assignment statement 14 = stamp is not The left member of an assignment statement must always be the name of a variable. It cannot be a constant or formula.
Invalid assignment 14 = x; a + x = 2 + y; Why? cosc175/operators 5

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Given the declarations: void main() { int stuff; string name; int widget; int numWidgets; numWidgets = 10; numWidgets = numWidgets + 1; name = "toby“; stuff = numWidgets; widget = numWidgets * 2; } cosc175/operators 6
cosc175/operators 7 Assignment Statement What happens in memory numWidgets = 10; the value 10 is placed in the memory location numWidgets numWidgets = numWidgets + 1; numWidget is evaluated. Contains a 10, one is added to 10, 11 is stored at the memory location numWidgets name = "toby“; the four characters t-o-b-y are stored in the memory location name (note: The double quotes are used as delimiters and are not stored in memory.) stuff = numWidgets;

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