05-13-2011
hey thanks for answering my question. Another question i have is on CIDR form for IP addresses.
so here is an question + the answers. But I just dnt understand it, if possible can you explain it to me?
An ISP has obtained a group of IP addresses, which can be represented in the CIDR form as 224.192.48.0/20. The ISP has rented this IP address space to three organizations A, B, and C in proportion 0.5:0.25:0.25 in terms of address space size. Give an allocation scheme of IP addresses among organizations A, B, and C in the CIDR form.
Answer:
224.192.48.0/20 in CIDR form is equivalent to (subnet mask: 255.255.240.0, subnet number: 224.192.48.0)
224.192.48.0/20 --> 1110 0000 . 1100 0000 . 00110000 . 0000 0000
1110 0000 . 1100 0000 . 00110000 . 0000 0000/22
1110 0000 . 1100 0000 . 00110100 . 0000 0000/22
1110 0000 . 1100 0000 . 00111000 . 0000 0000/22
1110 0000 . 1100 0000 . 00111100 . 0000 0000/22
Thus, the first two subnets out of the above four can be assigned to organization A, the other two to organizations B and C respectively.
A: 224.192.48.0/21 after address aggregation
B: 224.192.56.0/22
C: 224.192.60.0/22
so what if we change the three organizations A, B, and C in proportion 4:3:1. How will this be done?
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LEARN ABOUT DEBIAN
extract_font_range
extract_font_range(3alleg4) Allegro manual extract_font_range(3alleg4)
NAME
extract_font_range - Extracts a range of characters from a font. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
FONT *extract_font_range(FONT *f, int begin, int end)
DESCRIPTION
This function extracts a character range from a font and returns a new font that contains only the range of characters selected by this
function. You can pass -1 for either the lower or upper bound if you want to select all characters from the start or to the end of the
font. Example:
FONT *myfont;
FONT *capitals;
FONT *fontcopy;
...
/* Create a font of only capital letters */
capitals = extract_font_range(myfont, 'A', 'Z');
/* Create a copy of the font */
fontcopy = extract_font_range(myfont, -1, -1);
...
destroy_font(capitals);
destroy_font(fontcopy);
RETURN VALUE
Returns a pointer to the new font or NULL on error. Remember that you are responsible for destroying the font when you are finished with it
to avoid memory leaks.
SEE ALSO
get_font_range_begin(3alleg4), get_font_range_end(3alleg4), merge_fonts(3alleg4), transpose_font(3alleg4), exfont(3alleg4)
Allegro version 4.4.2 extract_font_range(3alleg4)