reverse-integer

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Algorithms

Given a signed 32-bit integer <code>x</code>, return <code>x</code> with its digits reversed. If reversing <code>x</code> causes the value to go outside the signed 32-bit integer range <code>[-231, 231 - 1]</code>, then return <code>0</code>.

Assume the environment does not allow you to store 64-bit integers (signed or unsigned).

&nbsp;
Example 1:

<pre>
Input: x = 123
Output: 321
</pre>

Example 2:

<pre>
Input: x = -123
Output: -321
</pre>

Example 3:

<pre>
Input: x = 120
Output: 21
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>-231 &lt;= x &lt;= 231 - 1</code></li>
</ul>

reverse

Reverse Integer

String to Integer (atoi)

string-to-integer-atoi

字符串转换整数 (atoi)

Reverse Bits

reverse-bits

颠倒二进制位

A Number After a Double Reversal

a-number-after-a-double-reversal

反转两次的数字

Count Number of Distinct Integers After Reverse Operations

count-number-of-distinct-integers-after-reverse-operations

反转之后不同整数的数目

Math

&#32473;&#20320;&#19968;&#20010; 32 &#20301;&#30340;&#26377;&#31526;&#21495;&#25972;&#25968; <code>x</code> &#65292;&#36820;&#22238;&#23558; <code>x</code> &#20013;&#30340;&#25968;&#23383;&#37096;&#20998;&#21453;&#36716;&#21518;&#30340;&#32467;&#26524;&#12290;

&#22914;&#26524;&#21453;&#36716;&#21518;&#25972;&#25968;&#36229;&#36807; 32 &#20301;&#30340;&#26377;&#31526;&#21495;&#25972;&#25968;&#30340;&#33539;&#22260;&nbsp;<code>[&minus;231,&nbsp; 231&nbsp;&minus; 1]</code> &#65292;&#23601;&#36820;&#22238; 0&#12290;
&#20551;&#35774;&#29615;&#22659;&#19981;&#20801;&#35768;&#23384;&#20648; 64 &#20301;&#25972;&#25968;&#65288;&#26377;&#31526;&#21495;&#25110;&#26080;&#31526;&#21495;&#65289;&#12290;

&nbsp;

&#31034;&#20363; 1&#65306;

<pre>
&#36755;&#20837;&#65306;x = 123
&#36755;&#20986;&#65306;321
</pre>

&#31034;&#20363; 2&#65306;

<pre>
&#36755;&#20837;&#65306;x = -123
&#36755;&#20986;&#65306;-321
</pre>

&#31034;&#20363; 3&#65306;

<pre>
&#36755;&#20837;&#65306;x = 120
&#36755;&#20986;&#65306;21
</pre>

&#31034;&#20363; 4&#65306;

<pre>
&#36755;&#20837;&#65306;x = 0
&#36755;&#20986;&#65306;0
</pre>

&nbsp;

&#25552;&#31034;&#65306;

<ul>
	<li><code>-231 <= x <= 231 - 1</code></li>
</ul>

Sunbelt Computer Software

PL/B Language Development and Support