# Python Exercises: Calculate the sum of two numbers given as strings

## Python String: Exercise-112 with Solution

Write a Python program to calculate the sum of two numbers given as strings. Return the result in the same string representation.

**Sample Data:**

( “234242342341”, “2432342342”) -> “236674684683”

( “”, “2432342342”) -> False

( “1000”, “10”) -> “1010”

**Sample Solution-1:**

**Python Code:**

```
def test(x, y):
if (x=="" or y==""):
return False
m = max(len(x), len(y))
c = 0
result = ''
for x, y in zip(x.rjust(m, '0')[::-1], y.rjust(m, '0')[::-1]):
s = int(x) + int(y) + c
c = 1 if s > 9 else 0
result += str(s)[-1]
result = result + str(c) if c == 1 else result
return result[::-1]
n1 ="234242342341"
n2 ="2432342342"
print("Original string numbers:", n1,n2)
print("Check said two strings contain three letters at the same index:")
print(test(n1, n2))
n1 =""
n2 ="2432342342"
print("Original string numbers:", n1,n2)
print("Check said two strings contain three letters at the same index:")
print(test(n1, n2))
n1 ="1000"
n2 ="0"
print("Original string numbers:", n1,n2)
print("Check said two strings contain three letters at the same index:")
print(test(n1, n2))
n1 ="1000"
n2 ="10"
print("Original string numbers:", n1,n2)
print("Check said two strings contain three letters at the same index:")
print(test(n1, n2))
```

Sample Output:

Original string numbers: 234242342341 2432342342 Check said two strings contain three letters at the same index: 236674684683 Original string numbers: 2432342342 Check said two strings contain three letters at the same index: False Original string numbers: 1000 0 Check said two strings contain three letters at the same index: 1000 Original string numbers: 1000 10 Check said two strings contain three letters at the same index: 1010

**Flowchart:**

## 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(x, y):
if (x=="" or y==""):
return False
return str(int(x) + int(y))
n1 ="234242342341"
n2 ="2432342342"
print("Original string numbers:", n1,n2)
print("Calculate the sum of two said numbers given as strings:")
print(test(n1, n2))
n1 =""
n2 ="2432342342"
print("Original string numbers:", n1,n2)
print("Calculate the sum of two said numbers given as strings:")
print(test(n1, n2))
n1 ="1000"
n2 ="0"
print("Original string numbers:", n1,n2)
print("Calculate the sum of two said numbers given as strings:")
print(test(n1, n2))
n1 ="1000"
n2 ="10"
print("Original string numbers:", n1,n2)
print("Calculate the sum of two said numbers given as strings:")
print(test(n1, n2))
```

Sample Output:

Original string numbers: 234242342341 2432342342 Calculate the sum of two said numbers given as strings: 236674684683 Original string numbers: 2432342342 Calculate the sum of two said numbers given as strings: False Original string numbers: 1000 0 Calculate the sum of two said numbers given as strings: 1000 Original string numbers: 1000 10 Calculate the sum of two said numbers given as strings: 1010

**Flowchart:**

## 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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