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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1en.wikipedia.org/wiki/Scientific_notation#E_notation– chepnerSep 8, 2021 at 21:19
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5 Answers
1e5 is a number expressed using scientific notation, specifically E notation, and it means 1 multiplied by 10 to the 5th power (the 'e' meaning 'exponent').
So 1e5 equals 1*100000 and is equal to 100000. The three notations are interchangeable meaning the same.
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For more on the scientific notation, see en.wikipedia.org/wiki/Scientific_notation– MichaelDec 2, 2014 at 22:05
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1Just to note, for Python,
1e5and100000are slightly different in that one's afloatand one's anint. But they are equal.– wjandreaFeb 25, 2023 at 17:23
1e5 means 1 × 105.
Similarly, 12.34e-9 means 12.34 × 10−9.
Generally, AeB means A × 10B.
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3This! I think people who say 1e5 is equal to 10 to the 5th power are giving an incomplete answer. So I like your answer:
1x10^5. Thanks Dec 19, 2020 at 15:39
this is scientific notation for 10^5 = 100000
1e5 is 100000. 5 stand for the amount of zeros you add in behind that number. For example, lets say I have 1e7. I would put 7 zeros behind 1 so it will become 10,000,000. But lets say that the number is 1.234e6. You would still add 6 zeros at the end of the number so it's 1.234000000, but since there is that decimal, you would have to move it to the right 6 times since it's e6.
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this is the one definition I had in mind, but it was confusing some times. The accepted answer is better, more precise. Aug 26, 2022 at 14:11
The values like: 1e-8 or 1e5
means;
1e-8 = 1 * 10^(-8)
And
1e5 = 1 * 10