Is it possible to perform a mathematical calculation using a DOS echo, in a single line?

Question

For example, can I do

echo 3 + 5

and get 8?

Is it possible to do calculations using the date?

Answer 1

You can use set /a to calculate a mathematical expression:

set /a x=3+5
echo %x%

Edit: here's a one-liner:

@for /f usebackq %i in (`set /a 3 + 5`) do @echo %i