add-strings

java

python

python3

mysql

mssql

oraclesql

csharp

javascript

typescript

bash

swift

kotlin

dart

golang

ruby

scala

rust

racket

erlang

elixir

pythondata

postgresql

cangjie

Algorithms

Given two non-negative integers, <code>num1</code> and <code>num2</code> represented as string, return the sum of <code>num1</code> and <code>num2</code> as a string.

You must solve the problem without using any built-in library for handling large integers (such as <code>BigInteger</code>). You must also not convert the inputs to integers directly.

&nbsp;
Example 1:

<pre>
Input: num1 = &quot;11&quot;, num2 = &quot;123&quot;
Output: &quot;134&quot;
</pre>

Example 2:

<pre>
Input: num1 = &quot;456&quot;, num2 = &quot;77&quot;
Output: &quot;533&quot;
</pre>

Example 3:

<pre>
Input: num1 = &quot;0&quot;, num2 = &quot;0&quot;
Output: &quot;0&quot;
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= num1.length, num2.length &lt;= 104</code></li>
	<li><code>num1</code> and <code>num2</code> consist of only digits.</li>
	<li><code>num1</code> and <code>num2</code> don&#39;t have any leading zeros except for the zero itself.</li>
</ul>

addStrings

Add Strings

Add Two Numbers

add-two-numbers

两数相加

Multiply Strings

multiply-strings

字符串相乘

Add to Array-Form of Integer

add-to-array-form-of-integer

数组形式的整数加法

Math

String

Simulation

给定两个字符串形式的非负整数&nbsp;<code>num1</code> 和<code>num2</code>&nbsp;，计算它们的和并同样以字符串形式返回。

你不能使用任何內建的用于处理大整数的库（比如 <code>BigInteger</code>），&nbsp;也不能直接将输入的字符串转换为整数形式。

&nbsp;

示例 1：

<pre>
输入：num1 = "11", num2 = "123"
输出："134"
</pre>

示例 2：

<pre>
输入：num1 = "456", num2 = "77"
输出："533"
</pre>

示例 3：

<pre>
输入：num1 = "0", num2 = "0"
输出："0"
</pre>

&nbsp;

&nbsp;

提示：

<ul>
	<li><code>1 &lt;= num1.length, num2.length &lt;= 104</code></li>
	<li><code>num1</code> 和<code>num2</code> 都只包含数字&nbsp;<code>0-9</code></li>
	<li><code>num1</code> 和<code>num2</code> 都不包含任何前导零</li>
</ul>