Java printf - formatting Java printing with System.out.A printf format reference page (printf syntax).Here are a few links to other printf tutorials on our website: Here’s a little example that demonstrates several of these techniques in one printf statement: Printf("forward slashes are easier to print\n") Printf("print a single backslash by putting two in your string\n") Printf("print a newline character in a string\n") Printf("print a TAB character in a string\n") Printf("at the end of this string there is a newline character\n\n") Printf("how you normally print a newline character\n") Here are a few Perl printf examples that demonstrate how to print other characters in your output, including tabs, slashes, backslashes, and newlines. Printing tabs, slashes, backslashes, newlines This works for many simple programs, but for more robust programs you’ll probably want to do more work than this. Hopefully you can see from that example that one way to print currency is with two positions after the decimal, like this: Printing a much larger number with that same format Printf("printing a much larger number with that same format\n") Īnd here’s the output from those printf floating-point (decimal) examples:Įight wide, two positions after the decimalĮight wide, four positions after the decimalĮight-wide, two positions after the decimal, zero-filledĮight-wide, two positions after the decimal, left-justified Printf("eight-wide, two positions after the decimal, left-justified\n") Printf("eight-wide, two positions after the decimal, zero-filled\n") Printf("eight wide, four positions after the decimal\n") Printf("eight wide, two positions after the decimal\n") Printf("two positions after the decimal\n") Printf("one position after the decimal\n") The following Perl printf code demonstrates how to format floating-point output: Right-justified (default) integer output: # five characters wide, zero-filled integer outputĪnd here’s the output from that source code: Printf("left-justified integer output:\n") Printf("right-justified (default) integer output:\n") These examples show how to control field widths, printing left-justified, right-justified, and zero-filled. The following code demonstrates how to print integers with Perl, using the printf function. That code results in the following output: # a string with a minimum length, right-justified I’ll use single quotes in all my printf examples to help demonstrate left- and right-justification. Here are several examples that show how to format strings with Perl and printf. Hopefully this list covers the most common Perl printf printing options you’ll run into, or will at least point you in the right direction. The print is more efficient and less error prone.Here’s a reference page (cheat sheet) of Perl printf formatting options. Just use print if you want to print the contents of $_.ĭon't fall into the trap of using a printf when a simple print would do. However, this will rarely do what you want if $_ contains formatting codes, they will be replaced with the empty string and a warning will be emitted if warnings are enabled. See perllocale and POSIX.įor historical reasons, if you omit the list, $_ is used as the format to use FILEHANDLE without a list, you must use a bareword filehandle like FH, not an indirect one like $fh. If use locale (including use locale ':not_characters') is in effect and POSIX::setlocale has been called, the character used for the decimal separator in formatted floating-point numbers is affected by the LC_NUMERIC locale setting. Returns a string formatted by the usual printf conventions of theC library function sprintf. See sprintf for an explanation of the format argument. This means that will use $_ as the format. The first argument of the list will be interpreted as the printf format. The FORMAT and the LIST are actually parsed as a single list. # printf FILEHANDLE FORMAT, LIST # printf FILEHANDLE # printf FORMAT, LIST #printfĮquivalent to print FILEHANDLE sprintf(FORMAT, LIST), except that $\ (the output record separator) is not appended.
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