In 3.4e-38 what is meant by 'e'?

Question

In C language

Answer 1

Not in C language but everywhere e means this:
For simple case:- 2e5
It means, 2 × 10 ^ 5
So, you can say that, e means × 10 ^

In your case, it means, 3.4 × 10 ^ -38

Note: Just to make clear, ^ is used to raise any number to the given power, like 2 ^ 3 = 2 × 2 × 2 = 8

Answer 2

Zlytherin nailed it. In addition, it's known as scientific notation or sometimes e-notation for anyone who's interested. 😉