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Difference between ; and , in for loop

• To: mathgroup at smc.vnet.net
• Subject: [mg113917] Difference between ; and , in for loop
• From: graser <graser at gmail.com>
• Date: Thu, 18 Nov 2010 07:03:57 -0500 (EST)

Hi Mathematica Group,

Would anyone explain me the difference between ; and , in conditional
loop like for loop?
For example,

1) For[i = 1, i < 2, i++; Print[i]]
Answer is 2

But

2)  For[i = 1, i < 2, i++, Print[i]]
The Answer is 1

Why does first loop get  2 instead of 1?

Thanks!