import os
os.system('clear')
print('**************************')
print(' MATHLETE CALCULATOR ')
print('__________________________')
print('add | Add two numbers ')
print('sub | Subtract two numbers')
print('mul | Multiply two numbers')
print('div | Divide two numbers ')
print('__________________________')
selection = input('Selection: ')
print('__________________________')
print('Calculating "c" for expression:' )
a = 0
b = 0
while selection == 'add':
print(' ')
print(' a + b = c ')
print(' ')
print('Please, enter values for "a" and "b"')
print(' ')
a = int(input('a = '))
b = int(input('b = '))
add = a + b
print(' ')
print('RESULT: ', a, '+', b, '=', add)
if selection == 'sub':
print(' ')
print(' a - b = c ')
print(' ')
print('Please, enter values for "a" and "b"')
print(' ')
a = int(input('a = '))
b = int(input('b = '))
sub = a - b
print(' ')
print('RESULT: ', a, '-', b, '=', sub)
elif selection == 'mul':
print(' ')
print(' a * b = c ')
print(' ')
print('Please, enter values for "a" and "b"')
print(' ')
a = int(input('a = '))
b = int(input('b = '))
mul = a * b
print(' ')
print('RESULT: ', a, '*', b, '=', mul)
elif selection == 'div':
print(' ')
print(' a / b = c ')
print(' ')
print('Please, enter values for "a" and "b"')
print(' ')
a = int(input('a = '))
b = int(input('b = '))
div = a / b
print(' ')
print('RESULT: ', a, '/', b, '=', div)
input('Press enter to continue...')