VFP Tutorial - Do While ... EndDo loop

The Do While ... EndDo loop in FoxPro executes a section of code several times whilst an expression remains true. The loop may execute zero, once or many times. This example will keep keep adding to a total until that total reaches 100;

If the expression lnTotal < lnLimit evaluates as true (.T. in FoxPro) then the statements in the loop will be executed and the expression will be evaluated again. The loop will continue until the expression evaluates as false (.F. in FoxPro).

If the expression evaluates as false when FoxPro first reaches it then the statements inside the body of the loop will never be executed.

Notes

The test 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.

This is the only form of the while loop in Foxpro. There are no alternative forms with the expression being tested at the end of the loop or with the logic inverted so that the loop runs until the expression evaluates as true.

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