格式化字符串

350px|thumb|alt=Diagram illustrating syntax of printf function. The first argument to the function is a template string, which may contain format specifiers, which are introduced with the percent sign (%) character. Format specifiers instruct printf how to interpret and output values given in the corresponding arguments which follow the format string. printf replaces the format specifiers with the accordingly-interpreted contents of the remaining arguments, and outputs the result.|An example call to the printf function