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DOS批处理 & 脚本技术（批处理室） » Question about 0+0

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Floor1　guxingyibei	Posted 2007-05-22 16:28
初级用户　Posts 32　Credits 68
Inside a for loop, like for /l %c in (0,0,0) do echo %c, why does it become an endless loop? Shouldn't it be the same as for /l %c in (1,1,1) do echo %c?

Floor2　lxmxn	Posted 2007-05-22 19:36
版主　Posts 4,938　Credits 11,386
Because the increment in this for is 0, which means after each loop, the result is still the initial value 0, so it keeps looping. And with (1,1,1), after one loop it becomes 2, which is greater than the 1 at the end, so it only loops once. for /l %a in (1,0,1) do @echo %a is also an infinite loop.

Floor3　guxingyibei	Posted 2007-05-25 10:25
初级用户　Posts 32　Credits 68
Got it! Thanks, lxmxn moderator

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