Merge pull request #4 from imadahmad97/adding_basic_calculator

Added basic calculator app

Author: tristanhdez

.DS_Store

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+# Calulator
+
+### A basic calculator app that takes two numbers as input, then performs *one of* addition, multiplication, subtraction, division.
+
+### To run
+
+You need to put the next command to run background:
+
+For **Windows**:
+```
+pythonw .\main.py
+```
+
+For **Linux**:
+```
+python3 main.py&
+```
+
+or run:
+```
+python3 main.py
+```
+

Calculator/.DS_Store

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+# Basic calculator functions that take two numbers
+def add(a,b): 
+    return a + b
+
+def subtract(a,b): 
+    return a - b
+
+def multiply(a,b): 
+    return a * b
+
+def divide(a,b): 
+    return a / b
+
+
+# Defining variables from user input
+# Note: input() returns a string, so we need to convert to int for numbers
+a = int(input('What is your first number? '))
+b = int(input('What is your second number? '))
+c = input('What operation would you like to perform (add, subtract, multiply or divide)? ')
+
+# Calling the appropriate function based on user input
+# Returning the result as an f-string
+if c == 'add':
+    print(f'result: {add(a,b)}')
+elif c == 'subtract':
+    print(f'result: {subtract(a,b)}')
+elif c == 'multiply':
+    print(f'result: {multiply(a,b)}')
+elif c == 'divide':
+    print(f'result: {divide(a,b)}')