Generate ASCII Table in 4 columns

ASCII_Table.c

#include <stdio.h>

int main(void)
{
  int i, col, code;
  char* char_name[32];
  char_name[0] = "NUL";
  char_name[1] = "SOH";
  char_name[2] = "STX";
  char_name[3] = "ETX";
  char_name[4] = "EOT";
  char_name[5] = "ENQ";
  char_name[6] = "ACK";
  char_name[7] = "BEL";
  char_name[8] = "BS";
  char_name[9] = "TAB";
  char_name[10] = "LF";
  char_name[11] = "VT";
  char_name[12] = "FF";
  char_name[13] = "CR";
  char_name[14] = "SO";
  char_name[15] = "SI";
  char_name[16] = "DLE";
  char_name[17] = "DC1";
  char_name[18] = "DC2";
  char_name[19] = "DC3";
  char_name[20] = "DC4";
  char_name[21] = "NAK";
  char_name[22] = "SYN";
  char_name[23] = "ETB";
  char_name[24] = "CAN";
  char_name[25] = "EM";
  char_name[26] = "SUB";
  char_name[27] = "ESC";
  char_name[28] = "FS";
  char_name[29] = "GS";
  char_name[30] = "RS";
  char_name[31] = "US";

  printf("DEC\tHEX\tOCT  SYMBOL\t\tDEC\tHEX\tOCT  SYMBOL\t\tDEC\tHEX\tOCT  SYMBOL\t\tDEC\tHEX\tOCT  SYMBOL\n");
  printf("==============================\t\t==============================\t\t==============================\t\t==============================\t\t\n");
  for ( i = 0; i < 32; i++ ) {
    for ( col = 0; col < 4; col++ ) {
      code = 32 * col + i;
      if ( col == 0 ) {
        printf("%3d\t%2X\t%2o\t%s\t\t", code, code, code, char_name[code]);     // Control characters
      } else
        printf("%3d\t%2X\t%2o\t%c\t\t", code, code, code, code);                // Other characters
    }
    printf("\n");
  }
}

ASCII TABLE

ASCII is the most fundamental character coding map for information technology as well as some engineering technologies. It is also a basic table for other coding method, such as UTF-8.

In general, we represent the codes in DECimal, HEXadecimal and OCTal forms, and name the characters represents "SYMBOL", for not all codes represent characters. Instead, some of them are "Control Characters" which are not printable, they are used to control some data transmission mechanism, or rendering on screen.

Those codes under decimal 32 are control codes. Please refer following list:

Dec	Hex	SYMBOL	Description
0	0	NULL	Null (nothing, used to terminate something or symbolize idle
1	1	SOH	Start of Heading, for data communication preamble
2	2	STX	Start of Text, Following data are TEXT data
3	3	ETX	End of Text. Trail the TEXT data to indicate end of data.
4	4	EOT	End of Transmission. Trail the whole data to indicate end of transmission.
5	5	ENQ	Enquiry. Means the issuer need some response from the other side.
6	6	ACK	Acknowledge. Means recognize reception of transmitted data, before any error corrections.
7	7	BEL	Bell. Make bell "ding" on the machine.
8	8	BS	Backspace. To backspace ONE position to previous position.
9	9	TAB	Horizontal tab. Push cursor forward n position right to current position.
<span #style="color:red">10	A	LF	Line Feed. Send cursor to next line.
11	B	VT	Vertical Tab. Send cursor to same position of next line.
12	C	FF	Form Feed. Send cursor to new page.
13	D	CR	Carriage Return. Send cursor to start of line.
14	E	SO	Shift out.
15	F	SI	Shift in.
16	10	DLE	Data Link Escape.
17	11	DC1	Device Control 1.
18	12	DC2	Device Control 2.
19	13	DC3	Device Control 3
20	14	DC4	Device Control 4
21	15	NAK	Negative Acknowledge.
22	16	SYN	Synchronous idel.
23	17	ETB	End of Frame, or Block.
24	18	CAN	Cancel
25	19	EM.	End of Medium.
26	1A	SUB	Substitute
27	1B	ESC	Escape
28	1C	FS	File Separator
29	1D	GS	Group Separator
30	1E	RS	Record Separator
31	1F	US	Unit Separator