batch file for loop why % code example

Example 1: batch script loop

// batch for loop
for /l %%x in (1, 1, 100) do (
   echo %%x
   copy %%x.txt z:\whatever\etc
)

Example 2: batch script loop

for /l %x in (1, 1, 100) do (
   echo %x
   copy %x.txt z:\whatever\etc
)