When using a floating point constant in C, what's the difference between using E and e (or G and g, for that matter)?

For example, what's the difference between 1.575E1 and 1.575e1?

Isn't C supposed to be a case-sensitive language? If there's no difference between using E and e, why's that?

I've looked it up online and on the textbook I'm using and haven't been able to figure it out.

CodePudding user response：

There is no difference. 1.575E1 is the same as 1.575e1.

Just like there is no difference between 0xa and 0xA—they are both equal to 10, and have the same type.

In C, identifiers are case-sensitive. Identifiers are names of functions, types, variables, etc.