Batch Script language provides assignment operators.
The following table lists the available assignment operators.
| Operator | Description | Example |
|---|---|---|
= |
Assigns the value of the right operand to the left operand | set /A a=5 Output will be 5 |
+= |
Adds the right operand to the left operand and assigns the result to the left operand | set /A a=5 a+=3 Output will be 8 |
-= |
Subtracts the right operand from the left operand and assigns the result to the left operand | set /A a=5 a-=3 Output will be 2 |
*= |
Multiplies the right operand with the left operand and assigns the result to the left operand | set /A a=5 a*=3 Output will be 15 |
/= |
Divides the left operand by the right operand and assigns the result to the left operand | set /A a=6 a/=3 Output will be 2 |
%= |
Takes modulus using two operands and assigns the result to the left operand | set /A a=5 a%=3 Output will be 2 |
Example
The following code snippet shows how the various operators can be used.
@echo off
set /A a=5
echo %a%
set /A a+=5
echo %a%
set /A a-=5
echo %a%
set /A a*=5
echo %a%
set /A a/=5
echo %a%
set /A a%=5
echo %a%5
10
5
25
5
5