1
var num1, num2, sum
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num1 = prompt('Enter first number')
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num2 = prompt('Enter second number')
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sum = parseInt(num1) + parseInt(num2) // "+" means "add"
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alert('Sum = ' + sum) // "+" means combine into a string

1
def fib():
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    a, b = 0, 1
3
    while True:            # First iteration:
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        yield a            # yield 0 to start with and then
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        a, b = b, a + b    # a will now be 1, and b will also be 1, (0 + 1)
6

7
for index, fibonacci_number in zip(range(10), fib()):
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     print('{i:3}: {f:3}'.format(i=index, f=fibonacci_number))