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"Format placeholders
Formatting takes place via placeholders within the format string. For example, if a program wanted to print out a person's age, it could present the output by prefixing it with "Your age is ". To denote that we want the integer for the age to be shown immediately after that message, we may use the format string:
"Your age is %d."
The syntax for a format placeholder is
%[parameter][flags][width][.precision][length]type "
Mehr Informationen:
http://en.wikipedia.org/wiki/Printf_format_string
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