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VFP Tutorial - Do Case

Allows a choice between several actions:

Each Case statement is followed by an expression which must evaluate to true or false. FoxPro evaluates each of these in sequence.

If the expression following the first Case statement evaluates as true (.T. in FoxPro) then the statements between this Case and the next one will be executed. The rest of the structure will be skipped and execution will continue on the line following the EndCase statement.

If the first expression evaluates as false (.F. in FoxPro) then the next Case statements will be evaluated in turn until one is found to be true. If none are found to be true then the code following Otherwise will be executed.

Notes

_TALLY is a variable maintained by FoxPro which holds the number of records processed by the last command.

The condition must evaluate as .T. or .F. because the logical values in FoxPro are a separate data type and an integer result will not be interpreted as a logical value.

Be careful when designing a Case and remember that the expressions are evaluated in sequence. If you need to test whether something is greater than 1 or greater than 10 then you must test for greater than 10 first. If you test for greater than 1 first then a value such as 11 will satisfy that condition and the greater than 10 test will not be reached.

The Otherwise clause is optional. If it is not included and all the individual Case statements evaluate as false then none of the code will be executed.

Each Case can have an expression based on a different variable. This example works out the method of delivery from the value of the order, the weight of the goods and the country it has to be delivered to.

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