I started thinking about what you said, and I realized that it doesn't matter.
The goal is to replace strings of blanks with single blanks, and then I realized I was over-thinking it, and making it too complicated.
So I stripped out the counter, did away with all the unnecessary activity, and came up with this, which I believe is a better solution.
Thank you, Franklin,
Code:
/*
* copy2.c
*
* Exercise 1-9. Write a program to copy it's input to it's output,
* replacing each string of one or more blanks by a single blank.
*/
#include <stdio.h>
main(){
int c; // the current character
printf("\n\n");
while ((c = getchar()) != EOF) { // while not EOF
if (c == ' ') {
/* You enter this if loop if you hit one or more blank spaces.
No matter how many blank spaces there are, run through all of
them, doing nothing. */
while ((c = getchar()) == ' ') {
; // do nothing.
} // end while loop
/* c is now holding the first character afer however many blanks there were.
Replace all the blanks by printing one blank to output,
then leave the if loop and print the character. */
printf(" ");
} // end if loop
putchar(c);
} // end while loop
printf("\n\n");
} // end main
And now I believe I'll look at 1-10.
---------- Post updated at 13:49 ---------- Previous update was at 06:42 ----------
1-10 was a piece of cake, other than chasing my tail all over the book trying to print two backslashes...
I also don't get the idea of printing two backspaces.
If you backspace, you erase what you just typed, and there's nothing there-- so there's not ever anything to print!
Would there ever be a legitimate reason to record backspaces, and print them in output?
Seems like they would just make things complicated...
Code:
/*
* replace.c
*
* Exercise 1-10. Write a program to copy its input to its output, replacing each tab
* by \t, each backspace by \b and each backslash by \\. This makes tabs and backslashes
* visible in an unambiguous way.
*/
#include <stdio.h>
main(){
int c; // the character
while ((c = getchar())!= EOF) {
if (c == '\t') { // if it's a tab
printf("\\t");
} // end if
else if (c == '\b') { // backspace
printf("\\b");
} // end else if
else if (c == '\\') { // backslash
printf("\\\\");
} // end else if
else
putchar(c);
} // end while loop
} // end main
Hi,
I am a beginner at shell scripting, though I have several years of Oracle programming experience. Can anyone recommend a site where I can find some exercises on shell programming. Is there anywhere I can telnet as I dont have UNIX OS on my PC?
Thanks
Rohit (1 Reply)
I have just 3 things that I really need to know the solution, please allow me to show it.
any help would be nice
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Discussion started by: hiwolf25
1 Replies
LEARN ABOUT ULTRIX
cat
cat(1) General Commands Manual cat(1)Name
cat - concatenate and print data
Syntax
cat [ -b ] [ -e ] [ -n ] [ -s ] [ -t ] [ -u ] [ -v ] file...
Description
The command reads each file in sequence and displays it on the standard output. Therefore, to display the file on the standard output you
type:
cat file
To concatenate two files and place the result on the third you type:
cat file1 file2 > file3
To concatenate two files and append them to a third you type:
cat file1 file2 >> file3
If no input file is given, or if a minus sign (-) is encountered as an argument, reads from the standard input file. Output is buffered in
1024-byte blocks unless the standard output is a terminal, in which case it is line buffered. The utility supports the processing of 8-bit
characters.
Options-b Ignores blank lines and precedes each output line with its line number.
-e Displays a dollar sign ($) at the end of each output line.
-n Precedes all output lines (including blank lines) with line numbers.
-s Squeezes adjacent blank lines from output and single spaces output.
-t Displays non-printing characters (including tabs) in output. In addition to those representations used with the -v option, all tab
characters are displayed as ^I.
-u Unbuffers output.
-v Displays non-printing characters (excluding tabs and newline) as the ^x. If the character is in the range octal 0177 to octal 0241,
it is displayed as M-x. The delete character (octal 0177) displays as ^?. For example, is displayed as ^X.
See Alsocp(1), ex(1), more(1), pr(1), tail(1)cat(1)
01-18-2010
