for(3Tcl)							     for(3Tcl)

NAME    [Toc]    [Back]

     for - ``For'' loop

SYNOPSIS    [Toc]    [Back]

     for start test next body

DESCRIPTION    [Toc]    [Back]

     For is a looping command, similar in structure to the C for statement.
     The start,	next, and body arguments must be Tcl command strings, and test
     is	an expression string.  The for command first invokes the Tcl
     interpreter to execute start.  Then it repeatedly evaluates test as an
     expression; if the	result is non-zero it invokes the Tcl interpreter on
     body, then	invokes	the Tcl	interpreter on next, then repeats the loop.
     The command terminates when test evaluates	to 0.  If a continue command
     is	invoked	within body then any remaining commands	in the current
     execution of body are skipped; processing continues by invoking the Tcl
     interpreter on next, then evaluating test,	and so on.  If a break command
     is	invoked	within body or next, then the for command will return
     immediately.  The operation of break and continue are similar to the
     corresponding statements in C.  For returns an empty string.

KEYWORDS    [Toc]    [Back]

     for, iteration, looping


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