C - What is this syntax about? <<

Question

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

what does this sybol means please? "<<" for example: if (1 << var)

I want the name of the thing to study. Thank you.

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1 Answer

深蓝 · Answer 1 · 2021-10-17T00:56:03+0000

It shifts the bits in the integer 1 var positions to the left. So in effect it calculates 2 to the power of var.