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Formatting Data
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Format Specifier %a %A %b %B %c %d %h %H %e %E %f %g %G %o %n %s %S %t %T %x %X %% TABLE 4-2
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The Format Specifiers
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Conversion Applied Floating-point hexadecimal Boolean Character Decimal integer Hash code of the argument Scientific notation Decimal floating-point Uses %e or %f, whichever is shorter Octal integer Inserts a newline character String Time and date Integer hexadecimal Inserts a % sign
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Specifying a Minimum Field Width
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An integer placed between the % sign and the format conversion specifier acts as a minimum field-width specifier This pads the output with spaces to ensure that it reaches a certain minimum length If the string or number is longer than that minimum, it will still be printed in full The default padding is done with spaces If you want to pad with 0 s, place a 0 before the field-width specifier For example, %05d will pad a number of less than five digits with 0 s so that its total length is five The field-width specifier can be used with all format specifiers except %n
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Specifying Precision
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A precision specifier can be applied to the %f, %e, %g, and %s format specifiers It follows the minimum field-width specifier (if there is one) and consists of a period followed by an integer Its exact meaning depends upon the type of data to which it is applied When the precision specifier is applied to floating-point data formatted by %f or %e, it determines the number of decimal places displayed For example, %104f displays a number at least ten characters wide with four decimal places When using %g, the precision specifier determines the number of significant digits The default precision is 6
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Applied to strings, the precision specifier specifies the maximum field length For example, %57s displays a string at least five and not exceeding seven characters long If the string is longer than the maximum field width, the end characters will be truncated
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Using the Format Flags
Formatter recognizes a set of format flags that lets you control various aspects of a conversion All format flags are single characters, and a format flag follows the % in a format specification The flags are shown here:
Flag # 0 space + , ( Effect Left justification Alternate conversion format Output is padded with zeros rather than spaces Positive numeric output is preceded by a space Positive numeric output is preceded by a + sign Numeric values include group separators Negative numeric values are enclosed within parentheses
Of these, the # requires some explanation The # can be applied to %o, %x, %a, %e, and %f For %a, %e, and %f, the # ensures that there will be a decimal point even if there are no decimal digits If you precede the %x format specifier with a #, the hexadecimal number will be printed with a 0x prefix Preceding the %o specifier with # causes the number to be printed with a leading zero
The Uppercase Option
As mentioned earlier, several of the format specifiers have uppercase versions that cause the conversion to use uppercase where appropriate The following table describes the effect:
Specifier %A %B %E %G %H %S %T %X Effect Causes the hexadecimal digits a through f to be displayed in uppercase as A through F Also, the prefix 0x is displayed as 0X, and the p will be displayed as P Uppercases the values true and false Causes the e symbol that indicates the exponent to be displayed in uppercase Causes the e symbol that indicates the exponent to be displayed in uppercase Causes the hexadecimal digits a through f to be displayed in uppercase as A through F Uppercases the corresponding string Causes all alphabetical output related to the date or time (such as the names of months or the AM/PM indicator) to be displayed in uppercase Causes the hexadecimal digits a through f to be displayed in uppercase as A through F Also, the optional prefix 0x is displayed as 0X, if present
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