CalcController.cs

using CalcApi.Models;
using Microsoft.AspNetCore.Mvc;

namespace CalcApi.Controllers
{
    [Route("api/calc")]
    [ApiController]
    public class CalcController : ControllerBase
    {
        [HttpPost("add")]
        public IActionResult AddNumbers([FromBody]NumbersModel numbersModel)
        {
            return Ok(numbersModel.NumberOne + numbersModel.NumberTwo);
        }

        [HttpPost("subtract")]
        public IActionResult SubtractNumbers([FromBody]NumbersModel numbersModel)
        {
            return Ok(numbersModel.NumberOne - numbersModel.NumberTwo);
        }

        [HttpPost("multiply")]
        public IActionResult MultiplyNumbers([FromBody]NumbersModel numbersModel)
        {
            return Ok(numbersModel.NumberOne * numbersModel.NumberTwo);
        }

        [HttpPost("divide")]
        public IActionResult DivideNumbers([FromBody]NumbersModel numbersModel)
        {
            if (numbersModel.NumberTwo == 0)
                return BadRequest("Divisor cannot be zero");

            return Ok(numbersModel.NumberOne / numbersModel.NumberTwo);
        }
    }
}