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notation - What is the meaning of number 1e5?

I have seen in some codes that people define a variable and assign values like 1e-8 or 1e5.

for example

const int MAXN = 1e5 + 123;

What are these numbers? I couldn't find any thing on the web...

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1e5 is a number expressed using scientific notation and it means 10 to the 5th power (the e meaning 'exponent')

so 1e5 is equal to 100000, both notations are interchangeably meaning the same.


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