title: problems with integers in the python calculator
body: <p>I have 2 Problems.
  My first problem is that I do not know how to write the code for integers. The output should be written as an integer ... but when I use e.g 4.3+5 it does not work ... the answer should be "simply" 9...
  ValueError: invalid literal for int() with base 10:
  Can someone help me to write this small calculator?</p>
  
  <pre><code> operation = input('Select an operation (type "addition", 
  "subtraction", "multiplication", or "division" and hit enter)')
  datatype = input('Select a datatype (type "int" or "float" and hit 
  enter)')
  value1 = input('Value 1:')
  value2 = input('Value 2:')
  result = None  # This variable should be overwritten with the result of 
  your operation later.
  
  
  if datatype == "float":
      value1 = float(value1)
      value2 = float(value2)
  else:
      value1 = int(value1)
      value2 = int(value2)
  
  
  if operation == "addition":
      result = value1+value2
  
  elif operation == "subtraction":
      result = value1-value2
  
  elif operation == "multiplication":
      result = value1*value2
  
  elif operation == "division":
      result = value1/value2
  
  
  
  print(f"Result: {result}")
  </code></pre>
  
  <p>and here is some other problem at the output --> it always shows me the whole calculation ... but i only want the solution.</p>
  
  <h2>Output was:</h2>
  
  <pre><code> Select an operation (type "addition", "subtraction", "multiplication", 
   or "division" and hit enter)multiplication
   Select a datatype (type "int" or "float" and hit enter)float
   Value 1:123456789123456789123456789
   Value 2:-4.3
   123456789123456789123456789 * -4.3 =
   Result: -5.3086419323086415e+26
  </code></pre>
  
  <hr>
  
  <h2>Output should be:</h2>
  
  <pre><code>    Select an operation (type "addition", "subtraction", 
     "multiplication", or "division" and hit enter)multiplication
      Select a datatype (type "int" or "float" and hit enter)float
      Value 1:123456789123456789123456789
      Value 2:-4.3
      Result: -5.3086419323086415e+26
  </code></pre>