m2_break.hlp

是一个经济学管理应用软件 很难找的 但是经济学学生又必须用到

{smcl}
{* 18mar2005}{...}
{cmd:help m2 break}
{hline}
{* index for tt}{...}
{* index while tt}{...}
{* index do ... while tt}{...}
{* index break tt}{...}

{title:Title}

{p 4 4 2}
{bf:[M-2] break -- Break out of for, while, or do loop}


{title:Syntax}

	{cmd:for}, {cmd:while}, {it:or} {cmd:do {c -(}}
		...
		{cmd:if (}...{cmd:) {c -(}}
			...
			{cmd:break}
		{cmd:{c )-}}
	{cmd:{c )-}}
	{it:stmt}                        <- {cmd:break} {it:jumps here}
	...


{title:Description}

{p 4 4 2}
{cmd:break} exits the innermost {cmd:for}, {cmd:while}, or {cmd:do} loop.
Execution continues with the statement immediately following the close of the
loop, just as if the loop had terminated normally.

{p 4 4 2}
{cmd:break} nearly always occurs following an {cmd:if}.


{title:Remarks}

{p 4 4 2}
In the following code, 

	{cmd}for (i=1; i<=rows(A); i++) {
		for (j=1; j<=cols(A); j++) {
			{txt}...{cmd}
			if (A[i,j]==0) break
		}
		printf("j = %d\n", j)
	}{txt}

{p 4 4 2}
the {cmd:break} statement will be executed if any element of {cmd:A[i,j]} is
zero.  Assume that the statement is executed for {cmd:i}=2 and {cmd:j}=3.
Execution will continue with the {cmd:printf()} statement, which is to say,
the {cmd:j} loop will be canceled but the {cmd:i} loop will continue.
The value of {it:j} upon exiting the loop will be 3; when you break out 
of the loop, the {cmd:j++} is not executed.


{title:Also see}

{p 4 13 2}
Manual:  {hi:[M-2] break}

{p 4 13 2}
Online:  help for 
{bf:{help m2_for:[M-2] do}},
{bf:{help m2_for:[M-2] for}},
{bf:{help m2_while:[M-2] while}},
{bf:{help m2_continue:[M-2] continue}};
{bf:{help m2_intro:[M-2] intro}}
{p_end}