Do you very often use the DOS interface of Windows and love to invent new tips or command for DOS; then here is one…. which I hope you should like… using DIS interface to type numerical calucations.
Now open Command Prompt using the start menu or through the Windows Run menu (Windows Logo key + r) type cmd and press enter this will open command prompt…
Type cd\ to go to root directory… now notice the following calculations to understand more
C:\>set /a 2+2
4
C:\>set /a 2*(9/2)
8
C:\>set /a (2*9)/2
9
C:\>set /a “31>>2”
7
However; you can also do some more with this set command for a complete list type set /? to find complete set of command as shown below:
C:\>set /?
Displays, sets, or removes cmd.exe environment variables.
SET [variable=[string]]
variable Specifies the environment-variable name.
string Specifies a series of characters to assign to the variable.
Type SET without parameters to display the current environment variables.
If Command Extensions are enabled SET changes as follows:
SET command invoked with just a variable name, no equal sign or value
will display the value of all variables whose prefix matches the name
given to the SET command. For example:
SET P
would display all variables that begin with the letter ‘P’
SET command will set the ERRORLEVEL to 1 if the variable name is not
found in the current environment.
SET command will not allow an equal sign to be part of the name of
a variable.
Two new switches have been added to the SET command:
SET /A expression
SET /P variable=[promptString]
The /A switch specifies that the string to the right of the equal sign
is a numerical expression that is evaluated. The expression evaluator
is pretty simple and supports the following operations, in decreasing
order of precedence:
() – grouping
! ~ – – unary operators
* / % – arithmetic operators
+ – – arithmetic operators
<< >> – logical shift
& – bitwise and
^ – bitwise exclusive or
| – bitwise or
= *= /= %= += -= – assignment
&= ^= |= <<= >>=
, – expression separator
