Batch: Evaluating Mathematical Expressions

‘set /a expression’ is used to evaluate mathematical expressions.

Hello.bat

@echo off

set /A sum = 10 + 20
set /A subtraction = 10 - 20
set /A mul = 10 * 20
set /A div = 10 / 20

echo Sum of 10 and 20 is %sum%
echo Subtraction of 10 and 20 is %subtraction%
echo Multiplication of 10 and 20 is %mul%
echo Division of 10 and 20 is %div%

Output

C:\Users\Public>Hello

Sum of 10 and 20 is 30

Subtraction of 10 and 20 is -10

Multiplication of 10 and 20 is 200

Division of 10 and 20 is 0

You can use % operator to evaluate the variable values.

Hello.bat

@echo off

set a = 10
set b = 20

set /A sum = %a%+%b%
set /A subtraction = %a% - %b%
set /A mul = %a% * %b%
set /A div = %a% / %b%

echo Sum of %a% and %b% is %sum%
echo Subtraction of %a% and %b% is %subtraction%
echo Multiplication of %a% and %b% is %mul%
echo Division of %a% and %b% is %div%

Output

C:\Users\Public>Hello

Sum of 5 and 10 is 15

Subtraction of 5 and 10 is -5

Multiplication of 5 and 10 is 50

Division of 5 and 10 is 0

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