Variables

02Variables.bat

::this program will demonstrate variables in batch file
@echo off

::set is used to declare and initialize variables
::by default variables are declared in global scope
set var1=I am global variable

::to print the value of variable surrount by %%
echo "var1 value:: %var1%"

::to declare variable in local scope
SETLOCAL
set var_2=I am the local variable, my life limited to SETLOCAL block
echo %var_2 value:: var_2%
ENDLOCAL
::ENDLOCAL is used to terminate the local block and scope, var_2 variable will be destroyed & dead after this.

echo "var_2 value after ENDLOCAL:: %var_2%"

::/A param used to assign numeric value
set /A data_num=100
echo "data_num value:: %data_num%"

Output