CODEWITHSUNDEEP
pythonfunction
Programming Noob
Programming Noob

Reputation: 1332

Write a Sigma equation

I have an equation and want to sum it's results with different values. I enter a number using Number = input() and the equation takes numbers from the input according to an index. The wanted indices are from i = 1 to i = 4. The equation is : Number[i] + Number[i+1]*3 + i

So for example, if my input is Number = 879463, then firstly for i = 1 : Number[1] + Number[2]*3 + 1, which equals to 8 + 7*3 + 1 = 30

Then for i = 2 : Number[2] + Number[3]*3 + 2 .. and so on, until i = 4. At the end, sum the results and store in total.

Here is my code:

Number = input()

total = 0

def equation(i,Number):
    x = (Number[i] + Number[i+1]*3 + i)
    return x

for i in range(len(Number)):
    total += equation(i,Number)
    
print(total)

For this code I get the error:

IndexError: string index out of range

Am I even in the right direction here ?

Upvotes: 0

Views: 132

Answers (1)

Fabio
Fabio

Reputation: 26

# input is a string

number = input("Enter a number: ")

#  Two lists to store values, results and list of numbers

list_of_numbers = []
total = []

# List to store string values to integers

for i in number:
    list_of_numbers.append(int(i))
print(f'List = {list_of_numbers}')

# List to store values to total

for i in range(1, len(list_of_numbers)):
    result_equation = list_of_numbers[i - 1] + list_of_numbers[i] * 3 + i

    print(f'For i = {i},  {list_of_numbers[i - 1]} + {list_of_numbers[i]}*3 + {i} = {result_equation}')
    total.append(result_equation)

# Sum values
print(f'Total = {sum(total)}')

# Observation: Most of this code can  be erased as it is only used to print values on the screen.

Upvotes: 1

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