// pad.h - 功能头文件,用来对字符串操作,对字符串按要求进行填充,

// 如左填充 padl("123",6,"0") 结果是000123

// 格式说明: 左填充为例: padl("欲填充字符串(原始字符串)",填充后字符串总长度,"用来填充的字符串")-//Pad.h- Function header files used for string operations, as required to fill the string,// like the left padding padl ( " 123" , 6, " 0" )　result is 000123// Format Descr iption : Left padding, for example: padl ( " To fill a string (the original string),"　filled with the total length of the string after " is used to populate the string" )