NSLog各数据类型的输出

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

 

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

 

 

 

 

 

定义	说明
%@	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.
%%	‘%’ character
%d, %D, %i	Signed 32-bit integer (int)
%u, %U	Unsigned 32-bit integer (unsigned int)
%hi	Signed 16-bit integer (short)
%hu	Unsigned 16-bit integer (unsigned short)
%qi	Signed 64-bit integer (long long)
%qu	Unsigned 64-bit integer (unsigned long long)
%x	Unsigned 32-bit integer (unsigned int), printed in hexadecimal using the digits 0–9 and lowercase a–f
%X	Unsigned 32-bit integer (unsigned int), printed in hexadecimal using the digits 0–9 and uppercase A–F
%qx	Unsigned 64-bit integer (unsigned long long), printed in hexadecimal using the digits 0–9 and lowercase a–f
%qX	Unsigned 64-bit integer (unsigned long long), printed in hexadecimal using the digits 0–9 and uppercase A–F
%o, %O	Unsigned 32-bit integer (unsigned int), printed in octal
%f	64-bit floating-point number (double)
%e	64-bit floating-point number (double), printed in scientific notation using a lowercase e to introduce the exponent
%E	64-bit floating-point number (double), printed in scientific notation using an uppercase E to introduce the exponent
%g	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
%G	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
%c	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
%C	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
%s	Null-terminated array of 8-bit unsigned characters. %s interprets its input in the system encoding rather than, for example, UTF-8.
%S	Null-terminated array of 16-bit Unicode characters
%p	Void pointer (void *), printed in hexadecimal with the digits 0–9 and lowercase a–f, with a leading 0x
%L	Length modifier specifying that a following a, A, e, E, f, F, g, or G conversion specifier applies to a long double argument
%a	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
%A	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
%F	64-bit floating-point number (double), printed in decimal notation
%z	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
%t	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
%j	Length modifier specifying that a following d, i, o, u, x, or X conversion specifier applies to a intmax_t or uintmax_t argument

 

 参考链接：http://285746555.blog.51cto.com/2966432/715082

　　　　   http://www.blogjava.net/gembin/archive/2012/03/04/371188.html

 

 

 

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