Go Language FMT Package printf method detailed

This is a creation in Article, where the information may have evolved or changed.

The standard output stream of the go language differs from other languages (such as C # and Java) when printing to the screen, and here are some of the most common formatting input operations I've compiled.

General

• %vPrint the value of a variable in the default way
• %TTypes of print variables

Integer

• %+dSigned integral type, fmt.Printf("%+d", 255) output+255
• %qPrint single quotation marks
• %oOctal with no 0
• %#oOctal with 0
• %xlowercase hexadecimal
• %XHexadecimal in uppercase
• %#xHex with 0x
• %UPrint Unicode characters
• %#UTo print Unicode with characters
• %bBinary for printing integer type

Integer width

• %5dIndicates that the maximum length of the integer is 5, and the following code

    fmt.Printf("|%5d|", 1)  fmt.Printf("|%5d|", 1234567)

The output results are as follows:

|     1| | 1234567|

• %-5dInstead, the print results are automatically left-justified
• %05d0 is prepended to the number.

Float

• %f(=%.6f) 6-bit decimal point
• %e(=%.6e) 6-bit decimal point (scientific notation)
• %gUse the fewest numbers to represent
• %.3gUp to 3 digits to indicate
• %.3fUp to 3 decimal places to represent

String

• %sNormal output string
• %qstring with double quotation marks, quotes with escape characters in the string
• %#qString with anti-quotation marks, if the string has anti-quotes, use double quotation marks instead of
• %xConvert a string to lowercase 16 binary format
• %XConvert a string to uppercase 16 binary format
• % x16 binary format with spaces

String Width (example with 5)

• %5sMinimum width of 5
• %-5sMinimum width is 5 (left justified)
• %.5sMaximum width of 5
• %5.7sThe minimum width is 5 and the maximum width is 7
• %-5.7sThe minimum width is 5 and the maximum width is 7 (left-justified)
• %5.3sTruncated if the width is greater than 3
• %05sIf the width is less than 5, the string is preceded by 0

Struct

• %vNormal printing. Like what:{sam {12345 67890}}
• %+vWith the field name. Like what:{name:sam phone:{mobile:12345 office:67890}
• %#vUse go syntax to print.
  Like whatmain.People{name:”sam”, phone:main.Phone{mobile:”12345”, office:”67890”}}

Boolean

• %tPrint true or False

Pointer

• %pWith a 0x pointer
• %#pWithout a 0x pointer

Reference

• FMT. Printf format Reference (cheat sheet)