app.py

import streamlit as st

def add(num1,num2):
  return num1+num2

def sub(num1,num2):
  return num1-num2

def mul(num1,num2):
  return num1*num2

def div(num1,num2):
  return num1/num2

def main():
  st.title("MY CALCULATOR")
  num1 = st.number_input("enter a number")
  num2 = st.number_input("enter another number")

  operation = st.radio("select an option: ",("ADD","SUB","MUL","DIV"))
  
  if operation=="ADD":
    result = add(num1,num2)
  elif operation=="SUB":
    result = sub(num1,num2)
  elif operation=="MUL":
    result = mul(num1,num2)
  else:
    result = div(num1,num2)

  st.write("The Result is",result)


if __name__ == "__main__":
  main()