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面试准备

Language in C 面试题与答案

Test your skills through the online practice test: Language in C Quiz Online Practice Test

问题 11. How do I change the type of cursor and hide a cursor?

We can change the cursor type by using function _setcursortype( ). This function can change the cursor type to solid cursor and can even hide a cursor. Following code shows how to change the cursor type and hide cursor.

#include <conio.h>
main( )
{
/* Hide cursor */
_setcursortype ( _NOCURSOR ) ;

/* Change cursor to a solid cursor */
_setcursortype ( _SOLIDCURSOR ) ;

/* Change back to the normal cursor */
_setcursortype ( _NORMALCURSOR ) ;
}

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问题 12. How do I write code that would get error number and display error message if any standard error occurs?

Following code demonstrates this.

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

main( )
{
char *errmsg ;
FILE *fp ;
fp = fopen ( "C:file.txt", "r" ) ;
if ( fp == NULL )
{
errmsg = strerror ( errno ) ;
printf ( "n%s", errmsg ) ;
}
}
Here, we are trying to open 'file.txt' file. However, if the file does not exist, then it would cause an error. As a result, a value (in this case 2) related to the error generated would get set in errno. errno is an external int variable declared in 'stdlib.h' and also in 'errno.h'. Next, we have called sterror( ) function which takes an error number and returns a pointer to standard error message related to the given error number.

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问题 13. How do I write code to get the current drive as well as set the current drive?

The function getdisk( ) returns the drive number of current drive. The drive number 0 indicates 'A' as the current drive, 1 as 'B' and so on. The Setdisk( ) function sets the current drive. This function takes one argument which is an integer indicating the drive to be set. Following program demonstrates use of both the functions.

#include <dir.h>

main( )
{
int dno, maxdr ;

dno = getdisk( ) ;
printf ( "nThe current drive is: %cn", 65 + dno
) ;

maxdr = setdisk ( 3 ) ;
dno = getdisk( ) ;
printf ( "nNow the current drive is: %cn", 65 +
dno ) ;
}

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问题 14. The functions memcmp( ) and memicmp( )

The functions memcmp( ) and memicmp( ) compares first n bytes of given two blocks of memory or strings. However, memcmp( ) performs comparison as unsigned chars whereas memicmp( ) performs comparison as chars but ignores case (i.e. upper or lower case). Both the functions return an integer value where 0 indicates that two memory buffers compared are identical. If the value returned is greater than 0 then it indicates that the first buffer is bigger than the second one. The value less than 0 indicate that the first buffer is less than the second buffer. The following code snippet demonstrates use of both

#include <stdio.h>
#include <mem.h>

main( )
{
char str1[] = "This string contains some
characters" ;
char str2[] = "this string contains" ;
int result ;

result = memcmp ( str1, str2, strlen ( str2 ) ) ;
printf ( "nResult after comapring buffer using
memcmp( )" ) ;
show ( result ) ;

result = memicmp ( str1, str2, strlen ( str2 ) ) ;
printf ( "nResult after comapring buffer using
memicmp( )" ) ;
show ( result ) ;
}

show ( int r )
{
if ( r == 0 )
printf ( "nThe buffer str1 and str2 hold
identical data" ) ;
if ( r > 0 )
printf ( "nThe buffer str1 is bigger than buffer
str2" ) ;
if ( r < 0 )
printf ( "nThe buffer str1 is less than buffer
str2" ) ;
}

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问题 15. How do I write code to find an amount of free disk space available on current drive?

Use getdfree( ) function as shown in follow code.

#include <stdio.h>
#include <stdlib.h>
#include <dir.h>
#include <dos.h>

main( )
{
int dr ; struct dfree disk ;
long freesp ;

dr = getdisk( ) ;
getdfree ( dr + 1 , &disk ) ;

if ( disk.df_sclus == 0xFFFF )
{
printf ( "ngetdfree( ) function failedn");
exit ( 1 ) ;
}

freesp = ( long ) disk.df_avail
* ( long ) disk.df_bsec
* ( long ) disk.df_sclus ;
printf ( "nThe current drive %c: has %ld bytes
available as free spacen", 'A' + dr, freesp ) ;
}

17.

Use of array indices...
If we wish to store a character in a char variable ch and the character to be stored depends on the value of another variable say color (of type int), then the code would be as shown below:

switch ( color )
{
case 0 :
ch = 'R' ;
break ;
case 1 :
ch = 'G' ;
break ;
case 2 :
ch = 'B' ;
break ;
}
In place of switch-case we can make use of the value in color as an index for a character array. How to do this is shown in following code snippet.

char *str = "RGB' ;
char ch ;
int color ;
// code
ch = str[ color ] ;

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