String and slice of bytes
%s |
the uninterpreted bytes of the string or slice |
%q |
a double-quoted string safely escaped with Go syntax |
%x |
base 16, lower-case, two characters per byte |
%X |
base 16, upper-case, two characters per byte |
General
%v |
The value in a default format. When printing structs, the plus flag (%+v) adds field names. |
%#v |
a Go-syntax representation of the value |
%T |
a Go-syntax representation of the type of the value |
%% |
a literal percent sign; consumes no value |
The default format for %v
bool: |
%t |
int, int8 etc.: |
%d |
uint, uint8 etc.: |
%d, %x if printed with %#v |
float32, complex64, etc: |
%g |
string: |
%s |
chan: |
%p |
pointer: |
%p |
Other flags
+ |
always print a sign for numeric values; guarantee ASCII-only output for %q (%+q). |
- |
pad with spaces on the right rather than the left (left-justify the field). |
# |
alternate format: add leading 0 for octal (%#o), 0x for hex (%#x); 0X for hex (%#X); suppress 0x for %p (%#p); for %q, print a raw (backquoted) string if strconv.CanBackquote returns true; |
' ' (space) |
leave a space for elided sign in numbers (% d); put spaces between bytes printing strings or slices in hex (% x, % X). |
0 |
pad with leading zeros rather than spaces; for numbers, this moves the padding after the sign. |
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Boolean
%t |
the word true or false |
Integer
%b |
base 2 |
%c |
the character represented by the corresponding Unicode code point |
%d |
base 10 |
%o |
base 8 |
%q |
a single-quoted character literal safely escaped with Go syntax |
%x |
base 16, with lower-case letters for a-f |
%X |
base 16, with upper-case letters for A-F |
%U |
Unicode format: U+1234; same as "U+%04X" |
Floating-point and complex constituents
%b |
decimalless scientific notation with exponent a power of two, in the manner of strconv.FormatFloat with the 'b' format, e.g. -123456p-78 |
%e |
scientific notation, e.g. -1.234456e+78 |
%E |
scientific notation, e.g. -1.234456E+78 |
%f |
decimal point but no exponent, e.g. 123.456 |
%F |
synonym for %f |
%g |
%e for large exponents, %f otherwise |
%G |
%E for large exponents, %F otherwise |
Floating-point Precision
%f |
default width, default precision |
%9f |
width 9, default precision |
%.2f |
default width, precision 2 |
%9.2f |
width 9, precision 2 |
%9.f |
width 9, precision 0 |
Pointer
%p |
base 16 notation, with leading 0x |
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Nice! Starting now with GoLang this will be very helpful
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