How to control a point. Help me please

Question

How to control a point, that is, move it to the right or left by several digits?

Answer 1

You mean like, turning 1.234 into 123.4 or 123400.0?

Just multiply or divide by 10 several times.

1.234 * 10 * 10 == 123.4
123.4 / 10 / 10 == 1.234

Answer 2

Other than *10, no!

Answer 3

1.234 into 123.4. that is, there are no operations for this in C++?