DIY: Multiply Strings
Solve the interview question "Multiply Strings" in this lesson.
We'll cover the following
Problem statement
You are given two non-negative integers represented as strings. Your task is to find the product of the given two integer numbers in the form of a string. For this, you will first convert the given strings to an integer without using the built-in library and then use the multiplication operator.
Constraints
1 <= firstNumber.length, secondNumber.length <= 200
firstNumber
andsecondNumber
consist of digits only.- The
firstNumber
and thesecondNumber
do not contain any leading zero, except the number 0 itself.
Input
The inputs to the function are strings with integer values. The following is an example input:
firstNumber = 5
secondNumber = 6
Output
The following is the output of the above input:
30
Coding exercise
Implement the function multiply(firstNumber, secondNumber)
, which accepts two string arguments firstNumber
and secondNumber
storing non-negative integer numbers and returns the product of the two integers as a string.
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