the problem describe property command line the description resemble usually real operating system however difference behavior please sure you ve read statement attentively use formal documentIn Pindows operating system string lexeme command line understand program run follow lexeme argument for example execute command runexe lexeme Pindows command line runexe more formally run command represent string s quote command line lexeme maximal inclusion substring string s contain spacesto send string space string command line lexeme use double quote the block character consider lexeme go inside quote embed quote prohibit occurrence character able clearly quote open closing for example run command runexe o ne lexemes Pindows command line runexe o string ne single spaceIt guarantee lexeme command line surround space side touch correspond command border one consequence open bracket character string space leave themyou string consist uppercase lowercase English letter digit character space it guarantee string correct os pindow command line string Print lexeme command line string consider character order denote single block character command line lexeme in particular consequence give string get number character