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Python Exercise: Add two strings as they are numbers (Positive integer values)

Python String: Exercise-101 with Solution

Write a Python program to add two strings as they are numbers (Positive integer values). Return a message if the numbers are string.

Sample Solution-1:

Python Code:

def test(n1, n2):
    n1, n2 = '0' + n1, '0' + n2
    if (n1.isnumeric() and n2.isnumeric()):
        return str(int(n1) + int(n2))
    else:
        return 'Error in input!'
print(test("10", "32"))
print(test("10", "22.6"))
print(test("100", "-200")) 

Sample Output:

42
Error in input!
Error in input!

Flowchart:

Flowchart: Add two strings as they are numbers (Positive integer values).

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Sample Solution-2:

Python Code:

def test(n1, n2):
  if n1 == '':
    n1= '0'
  if n2 == '':
    n2 = '0'
  if n1.isdigit() and n2.isdigit():
    return str(int(n1)+int(n2))
  return 'Error in input!'
print(test("23", "43"))
print(test("12", "11.6"))
print(test("200", "-100"))

Sample Output:

66
Error in input!
Error in input!

Flowchart:

Flowchart: Add two strings as they are numbers (Positive integer values).

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor:

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Previous Python Exercise: Check whether any word in a given sting contains duplicate characrters or not.
Next Python Exercise: Remove punctuations from a string.

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Python: Tips of the Day

Getting rid of unwanted characters:

You can get rid of whitespaces or any specific character using strip methods in Python. You can use either plain strip for both sides, lstrip for the left side and rstrip for the right side only.

str="+++Welcome python+++"
str.strip()

print(str)

Output:

+++Welcome python+++