Calculation that can be done here

1. Addition
2. Subtraction

1. REST

For addition

GET http://localhost:8080/api/add?num1=2&num2=3

For subtraction

GET http://localhost:8080/api/subtract?num1=20&num2=3.3

2. SOAP

For both addition and subtraction, use

POST http://localhost:8080/ws

Note: In Postman go to Headers then add Content-Type in Key and text/xml in Value

For addition

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
                  xmlns:web="http://harish.com/calculator">
   <soapenv:Header/>
   <soapenv:Body>
      <web:AddRequest>
         <web:number1>10.5</web:number1>
         <web:number2>5.5</web:number2>
      </web:AddRequest>
   </soapenv:Body>
</soapenv:Envelope>

For subtraction

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
                  xmlns:web="http://harish.com/calculator">
   <soapenv:Header/>
   <soapenv:Body>
      <web:SubtractRequest>
         <web:number1>10.5</web:number1>
         <web:number2>5.5</web:number2>
      </web:SubtractRequest>
   </soapenv:Body>
</soapenv:Envelope>