NSLog各数据类型的输出

灰太狼 2023-05-30 08:52 85阅读 0赞

## [NSLog各数据类型的输出][NSLog] ##

<table> 
 <tbody> 
 <tr> 
 <td style="vertical-align:top;"> 类型 </td> 
 <td style="vertical-align:top;"> 常量实例 </td> 
 <td style="vertical-align:top;"> NSlog字符 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Char </td> 
 <td style="vertical-align:top;"> ‘a’,’/n’ </td> 
 <td style="vertical-align:top;"> %c </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Short int </td> 
 <td style="vertical-align:top;"> -- </td> 
 <td style="vertical-align:top;"> %hi,%hx,%ho </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Unsigned short int </td> 
 <td style="vertical-align:top;"> -- </td> 
 <td style="vertical-align:top;"> %hu,%hx,%ho </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Int </td> 
 <td style="vertical-align:top;"> 12,-97,0xFFE0,0177 </td> 
 <td style="vertical-align:top;"> %i,%x,%o </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Unsigned int </td> 
 <td style="vertical-align:top;"> 12u,100U,0xFFu </td> 
 <td style="vertical-align:top;"> %u,%x,%o </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Long int </td> 
 <td style="vertical-align:top;"> 12L,-200l,0xffffL </td> 
 <td style="vertical-align:top;"> %li,%lx,%lo </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Unsigned long int </td> 
 <td style="vertical-align:top;"> 12UL,100ul,0xffeeUL </td> 
 <td style="vertical-align:top;"> %lu,%lx,%lo </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Long long int </td> 
 <td style="vertical-align:top;"> 0xe5e5c5e5LL,500ll </td> 
 <td style="vertical-align:top;"> %lli,%llx,%llo </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Unsigned long long int </td> 
 <td style="vertical-align:top;"> 12ull,0xffeeULL </td> 
 <td style="vertical-align:top;"> %llu,%llx,%llo </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Float </td> 
 <td style="vertical-align:top;"> 12.34f,3.1e-5f, </td> 
 <td style="vertical-align:top;"> %f,%e,%g,%a </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Double </td> 
 <td style="vertical-align:top;"> 12.34,3.1e-5,0x.1p3 </td> 
 <td style="vertical-align:top;"> %f,%e,%g,%a </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Long double </td> 
 <td style="vertical-align:top;"> 12.34l,3.1e-5l </td> 
 <td style="vertical-align:top;"> %Lf,%Le,%Lg </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> id </td> 
 <td style="vertical-align:top;"> nil </td> 
 <td style="vertical-align:top;"> %p </td> 
 </tr> 
 </tbody> 
</table>

### 格式 ###

NSLog的格式如下所示：

*  %@     对象
 *  %d, %i 整数
 *  %u     无符整形
 *  %f     浮点/双字
 *  %x, %X 二进制整数
 *  %o     八进制整数
 *  %zu    size\_t
 *  %p     指针
 *  %e     浮点/双字 （科学计算）
 *  %g     浮点/双字 
 *  %s     C 字符串
 *  %.\*s   Pascal字符串
 *  %c     字符
 *  %C     unichar
 *  %lld   64位长整数（long long）
 *  %llu   无符64位长整数
 *  %Lf    64位双字

<table> 
 <tbody> 
 <tr> 
 <td>定义</td> 
 <td>说明</td> 
 </tr> 
 <tr> 
 <td>%@</td> 
 <td>Objective-C object, printed as the string returned by descriptionWithLocale: if available, or description otherwise. Also works with CFTypeRef objects, returning the result of the CFCopyDescription function.</td> 
 </tr> 
 <tr> 
 <td>%%</td> 
 <td>‘%’ character</td> 
 </tr> 
 <tr> 
 <td>%d, %D, %i</td> 
 <td>Signed 32-bit integer (int)</td> 
 </tr> 
 <tr> 
 <td>%u, %U</td> 
 <td>Unsigned 32-bit integer (unsigned int)</td> 
 </tr> 
 <tr> 
 <td>%hi</td> 
 <td>Signed 16-bit integer (short)</td> 
 </tr> 
 <tr> 
 <td>%hu</td> 
 <td>Unsigned 16-bit integer (unsigned short)</td> 
 </tr> 
 <tr> 
 <td>%qi</td> 
 <td>Signed 64-bit integer (long long)</td> 
 </tr> 
 <tr> 
 <td>%qu</td> 
 <td>Unsigned 64-bit integer (unsigned long long)</td> 
 </tr> 
 <tr> 
 <td>%x</td> 
 <td>Unsigned 32-bit integer (unsigned int), printed in hexadecimal using the digits 0–9 and lowercase a–f</td> 
 </tr> 
 <tr> 
 <td>%X</td> 
 <td>Unsigned 32-bit integer (unsigned int), printed in hexadecimal using the digits 0–9 and uppercase A–F</td> 
 </tr> 
 <tr> 
 <td>%qx</td> 
 <td>Unsigned 64-bit integer (unsigned long long), printed in hexadecimal using the digits 0–9 and lowercase a–f</td> 
 </tr> 
 <tr> 
 <td>%qX</td> 
 <td>Unsigned 64-bit integer (unsigned long long), printed in hexadecimal using the digits 0–9 and uppercase A–F</td> 
 </tr> 
 <tr> 
 <td>%o, %O</td> 
 <td>Unsigned 32-bit integer (unsigned int), printed in octal</td> 
 </tr> 
 <tr> 
 <td>%f</td> 
 <td>64-bit floating-point number (double)</td> 
 </tr> 
 <tr> 
 <td>%e</td> 
 <td>64-bit floating-point number (double), printed in scientific notation using a lowercase e to introduce the exponent</td> 
 </tr> 
 <tr> 
 <td>%E</td> 
 <td>64-bit floating-point number (double), printed in scientific notation using an uppercase E to introduce the exponent</td> 
 </tr> 
 <tr> 
 <td>%g</td> 
 <td>64-bit floating-point number (double), printed in the style of %e if the exponent is less than –4 or greater than or equal to the precision, in the style of %f otherwise</td> 
 </tr> 
 <tr> 
 <td>%G</td> 
 <td>64-bit floating-point number (double), printed in the style of %E if the exponent is less than –4 or greater than or equal to the precision, in the style of %f otherwise</td> 
 </tr> 
 <tr> 
 <td>%c</td> 
 <td>8-bit unsigned character (unsigned char), printed by NSLog() as an ASCII character, or, if not an ASCII character, in the octal format \\ddd or the Unicode hexadecimal format \\udddd, where d is a digit</td> 
 </tr> 
 <tr> 
 <td>%C</td> 
 <td>16-bit Unicode character (unichar), printed by NSLog() as an ASCII character, or, if not an ASCII character, in the octal format \\ddd or the Unicode hexadecimal format \\udddd, where d is a digit</td> 
 </tr> 
 <tr> 
 <td>%s</td> 
 <td>Null-terminated array of 8-bit unsigned characters. %s interprets its input in the system encoding rather than, for example, UTF-8.</td> 
 </tr> 
 <tr> 
 <td>%S</td> 
 <td>Null-terminated array of 16-bit Unicode characters</td> 
 </tr> 
 <tr> 
 <td>%p</td> 
 <td>Void pointer (void *), printed in hexadecimal with the digits 0–9 and lowercase a–f, with a leading 0x</td> 
 </tr> 
 <tr> 
 <td>%L</td> 
 <td>Length modifier specifying that a following a, A, e, E, f, F, g, or G conversion specifier applies to a long double argument</td> 
 </tr> 
 <tr> 
 <td>%a</td> 
 <td>64-bit floating-point number (double), printed in scientific notation with a leading 0x and one hexadecimal digit before the decimal point using a lowercase p to introduce the exponent</td> 
 </tr> 
 <tr> 
 <td>%A</td> 
 <td>64-bit floating-point number (double), printed in scientific notation with a leading 0X and one hexadecimal digit before the decimal point using a uppercase P to introduce the exponent</td> 
 </tr> 
 <tr> 
 <td>%F</td> 
 <td>64-bit floating-point number (double), printed in decimal notation</td> 
 </tr> 
 <tr> 
 <td>%z</td> 
 <td>Length modifier specifying that a following d, i, o, u, x, or X conversion specifier applies to a size_t or the corresponding signed integer type argument</td> 
 </tr> 
 <tr> 
 <td>%t</td> 
 <td>Length modifier specifying that a following d, i, o, u, x, or X conversion specifier applies to a ptrdiff_t or the corresponding unsigned integer type argument</td> 
 </tr> 
 <tr> 
 <td>%j</td> 
 <td>Length modifier specifying that a following d, i, o, u, x, or X conversion specifier applies to a intmax_t or uintmax_t argument</td> 
 </tr> 
 </tbody> 
</table>

[NSLog]: https://www.cnblogs.com/tianglin/p/3541699.html