tweaked the AP code

app.py

@@ -1,7 +1,26 @@
 from fastapi import FastAPI
+from pydantic import BaseModel
+
+
+class User_input(BaseModel):
+    operation:str
+    x:float
+    y:float
+
+def calculate(operation, x, y):
+    return x/y
 
 app = FastAPI()
 
-@app.get("/")
+@app.get("/hello")
 def greet_json():
     return {"Hello": "World!"}
+
+
+@app.post("/calculate")
+def operate(input:User_input):
+    res= calculate(input.operation, input.x, input.y)
+    return res
+
+
+

requirements.txt

@@ -1,2 +1,3 @@
 fastapi
+pydantic
 uvicorn[standard]