void main( void ) { /* Call with 3 integers (-1 is used as terminator). */ printf( "Average is: %d\n", average( 2, 3, 4, -1 ) ); /* Call with 4 integers. */ printf( "Average is: %d\n", average( 5, 7, 9, 11, -1 ) ); /* Call with just -1 terminator. */ printf( "Average is: %d\n", average( -1 ) ); }/* Returns the average of a variable list of integers. */ #ifdef ANSI /* ANSI compatible version */ int average( int first, ... ) { int count = 0, sum = 0, i = first; va_list er; va_start( er, first ); /* Initialize variable arguments. */ while( i != -1 ) { sum += i; count++; i = va_arg( er, int); } va_end( er ); /* Reset variable arguments. */ return( sum ? (sum / count) : 0 ); } #else /* UNIX compatible version must use old-style definition. */ int average( va_alist ) va_dcl { int i, count, sum; va_list er; va_start( er ); /* Initialize variable arguments. */ for( sum = count = 0; (i = va_arg( er, int)) != -1; count++ ) sum += i; va_end( er ); /* Reset variable arguments. */ return( sum ? (sum / count) : 0 ); } #endif
{
char ch = 'h', *string = "computer";
int count = -9234;
double fp = 251.7366;
wchar_t wch = L'w', *wstring = L"Unicode"; /* Display integers. */
printf( "Integer formats:\n"
"\tDecimal: %d Justified: %.6d Unsigned: %u\n",
count, count, count, count ); printf( "Decimal %d as:\n\tHex: %Xh C hex: 0x%x Octal: %o\n",
count, count, count, count ); /* Display in different radixes. */
printf( "Digits 10 equal:\n\tHex: %i Octal: %i Decimal: %i\n",
0x10, 010, 10 ); /* Display characters. */ printf("Characters in field (1):\n%10c%5hc%5C%5lc\n", ch, ch, wch, wch);
wprintf(L"Characters in field (2):\n%10C%5hc%5c%5lc\n", ch, ch, wch, wch); /* Display strings. */ printf("Strings in field (1):\n%25s\n%25.4hs\n\t%S%25.3ls\n",
string, string, wstring, wstring);
wprintf(L"Strings in field (2):\n%25S\n%25.4hs\n\t%s%25.3ls\n",
string, string, wstring, wstring); /* Display real numbers. */
printf( "Real numbers:\n\t%f %.2f %e %E\n", fp, fp, fp, fp ); /* Display pointer. */
printf( "\nAddress as:\t%p\n", &count); /* Count characters printed. */
printf( "\nDisplay to here:\n" );
printf( "1234567890123456%n78901234567890\n", &count );
printf( "\tNumber displayed: %d\n\n", count );
}==============================================================
OutputInteger formats:
Decimal: -9234 Justified: -009234 Unsigned: 4294958062
Decimal -9234 as:
Hex: FFFFDBEEh C hex: 0xffffdbee Octal: 37777755756
Digits 10 equal:
Hex: 16 Octal: 8 Decimal: 10
Characters in field (1):
h h w w
Characters in field (2):
h h w w
Strings in field (1):
computer
comp
Unicode Uni
Strings in field (2):
computer
comp
Unicode Uni
Real numbers:
251.736600 251.74 2.517366e+002 2.517366E+002Address as: 0012FFACDisplay to here:
123456789012345678901234567890
Number displayed: 16
void PrintMessage( LPSTR lpszFormat, ... )
{
FILE* fp;
char aBuffer[MAX_PATH];
va_list va; va_start( va, lpszFormat );
vsprintf( aBuffer, lpszFormat, va );
va_end( va ); fp = fopen( "c:\\BSDebug.txt", "a" );
if( fp )
{
fprintf( fp, "%s", aBuffer );
fclose( fp );
}
}
{
/* Call with 3 integers (-1 is used as terminator). */
printf( "Average is: %d\n", average( 2, 3, 4, -1 ) ); /* Call with 4 integers. */
printf( "Average is: %d\n", average( 5, 7, 9, 11, -1 ) ); /* Call with just -1 terminator. */
printf( "Average is: %d\n", average( -1 ) );
}/* Returns the average of a variable list of integers. */
#ifdef ANSI /* ANSI compatible version */
int average( int first, ... )
{
int count = 0, sum = 0, i = first;
va_list er; va_start( er, first ); /* Initialize variable arguments. */
while( i != -1 )
{
sum += i;
count++;
i = va_arg( er, int);
}
va_end( er ); /* Reset variable arguments. */
return( sum ? (sum / count) : 0 );
}
#else /* UNIX compatible version must use old-style definition. */
int average( va_alist )
va_dcl
{
int i, count, sum;
va_list er; va_start( er ); /* Initialize variable arguments. */
for( sum = count = 0; (i = va_arg( er, int)) != -1; count++ )
sum += i;
va_end( er ); /* Reset variable arguments. */
return( sum ? (sum / count) : 0 );
}
#endif