12-06-2012
Look for 48 in the 'dec' column, you'll find the character 0 there. The nonprinting characters are in a separate section above the printing section, in it you'll find many characters which aren't used in text these days(binary is another matter) as well as familiar things like tab, backspace, newline, and carriage return.
Here is a more abbreviated table which just lumps everything together.
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PUTS(3) Linux Programmer's Manual PUTS(3)
NAME
fputc, fputs, putc, putchar, puts - output of characters and strings
SYNOPSIS
#include <stdio.h>
int fputc(int c, FILE *stream);
int fputs(const char *s, FILE *stream);
int putc(int c, FILE *stream);
int putchar(int c);
int puts(const char *s);
DESCRIPTION
fputc() writes the character c, cast to an unsigned char, to stream.
fputs() writes the string s to stream, without its trailing '