app.py

import streamlit as st

def add(x,y):
    return x+y
    
def sub(x,y):
    return x-y

def multiply(x,y):
    return x*y

def divide(x,y):
    if y==0:
        return "sorry not possible"
    else:
        return x/y

st.title("simple calculator by fsa")

num1=st.number_input("enter first no.:")
num2=st.number_input("enter second no.:")

choice=st.radio("select your choice",("ADD","SUB","MULTIPLY","DIVIDE")) 

if choice=="ADD":
    result = add(num1,num2)
elif choice=="SUB":
    result = sub(num1,num2)
elif choice=="MULTIPLY":
    result = multiply(num1,num2)
elif choice=="DIVIDE":
    result = divide(num1,num2)

st.write("RESULT IS:",result)