Language in C 面试题与答案

Question: How to run DIR command programmatically?

Answer: We can use the system( ) function to execute the DIR command along with its options. Following program shows how this can be achieved:

// mydir.c

main ( int argc, char *argv[ ] )
{
char str[30] ;

if ( argc < 2 )
exit ( 0 ) ;

sprintf ( str, "dir %s %s", argv[1], argv[2] ) ;
system ( str ) ;
}

If we run the executable file of this program at command prompt passing the command line arguments as follows:

> mydir abc.c /s

This will search the file 'abc.c' in the current directory.