Add Very Large Numbers | Dataford Interview Questions

How would you add two very large numbers? (approach only)

Asked in the Round 1 stage. Implement string-based addition without converting either input to a built-in numeric type.

Input and Output

Given two canonical decimal strings num1 and num2, return their exact sum as a decimal string.

Example 1: num1 = "12345678901234567890", num2 = "9876543210" returns "12345678911111111100".

Example 2: num1 = "999", num2 = "1" returns "1000", because the carry propagates across every digit.

def add_large_numbers(num1, num2):

Your question is Add Very Large Numbers. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

How would you add two very large numbers? (approach only)

Asked in the Round 1 stage. Implement string-based addition without converting either input to a built-in numeric type.

Given two canonical decimal strings num1 and num2, return their exact sum as a decimal string.

Example 1: num1 = "12345678901234567890", num2 = "9876543210" returns "12345678911111111100".

Example 2: num1 = "999", num2 = "1" returns "1000", because the carry propagates across every digit.

def add_large_numbers(num1, num2):

Your question is Add Very Large Numbers. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.