This Spring Boot app provides a single endpoint, which can be used to calculate the value of a String represented expression consisting of space separated integers and 4 possible operators: +, -, *, and /.
In short it allows to perform those four simple arithmetic operations between integers.
- Java 21
- Spring Boot 3.3.6
- Maven
- It needs to adhere to the maximum input length, which is configurable via environment variable (INPUT_LENGTH_LIMIT).
- It has to start and end with an integer.
- Only integers and 4 operators +, -, *, / are allowed in the string.
- All integers and operators need to be separated by space.
- Integers have to adhere to minimum and maximum Integer constraints in Java, with the limits being -2147483648 and 2147483647 respectively.
Example of correct input:
"97 + 256 - 3 * 13 / 21 + 46 / 29 * -98 - 145 + 2147483000"
There is only one endpoint:
request:
{
"integerString": String
}
response:
{
"result": BigDecimal
}
The app will run on port 8080, you can start it either:
- via InteliJ run configuration
- using
mvn spring-boot:runcommand - using spring-boot-mvn-plugin -> spring-boot:run
| Name | Default Value | Description |
|---|---|---|
INPUT_LENGTH_LIMIT |
1000 | Customisable maximum length of the input String |
RESULT_SCALE |
10 | Customisable scale of the calculations and the result. With scale of 10, the result will be calculated to the 10th decimal place |