CODEWITHSUNDEEP
python
user12245018
user12245018

Reputation:

Why is the elif statement invalid in this code?

a = float(input("Insert a floating point number:"))
n = int(input("Insert an integer number >= 0 :"))
accum = 1
count = 1

while n >= count and n >= 0: 
  accum = accum * a
  count += 1
elif n < 0:
    print("Integer value is less than 0")
if n >=0 and n < count:
  print(accum)

I need to create a code which asks the user for a floating point number 'a' then an integer to use as the power of 'a' which is 'n'. I need to use a while loop and it must be valid for n>=0 only. If I don't have the elif statement then the code runs normally.

Upvotes: 0

Views: 93

Answers (3)

chepner
chepner

Reputation: 530960

While technically you can put n >= 0 in the condition of the while loop to skip the loop if n < 0, it doesn't make sense to do so, because you never modify the value of n in the loop. It would be clearer to put the entire loop in the body of another if statement (which, incidentally, is the one which your elif—or else, as we'll see—would naturally belong to.)

a = float(input("Insert a floating point number:"))
n = int(input("Insert an integer number >= 0 :"))
accum = 1
count = 1

if n >= 0:
    while n >= count: 
        accum = accum * a
        count += 1

    # We already know n >= 0, and the only way
    # for the loop to exit is for n < count to be
    # true, so no additional testing needed before
    # we call print here.
    print(accum)
else:  # If n >= 0 is not true, n < 0 *must* be true
    print("Integer value is less than 0")

Upvotes: 1

Ravik
Ravik

Reputation: 734

You need to change the elif and if statement position

while n >= count and n >= 0: 
  accum = accum * a
  count += 1
if n >=0 and n < count:
      print(accum)
elif n < 0:
    print("Integer value is less than 0")

Else if always comes after if

Upvotes: 0

Vassilios
Vassilios

Reputation: 493

It's invalid because you firstly need to add an if statement and then follow it with an elif.

if n < 0:
    print("Integer value is less than 0")
elif n >=0 and n < count:
  print(accum)

Upvotes: 0

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