We've got i++, why not a "post-assignment" operator ?

Hi, We've got i++, which is an expression that assigns i+1 to i, but evaluates to the original value of i. It's called the postfix increment, or post-increment operator, isn't it ? I think that it would have been nice to have too a "post-assignment" operator, let's say ":=", that would assign a new value, but would evaluate to the original value: i := i+1; // emulates an i++ I was writing this the other day: callBack= queue[i]; queue[i]= nop; callBack(); With this "post-assignment" operator I could have written instead: ( queue[i] := nop )(); // which is nicer It'

why I must input 4 times?

code: ================================= #include <stdio.h> int main(void) { char str[4] = {0}, *p = str; for (int i = 0; i < 3; i++) scanf("%c\n", p++); printf("%s\n", str); return 0; } I input: a b c /* Oh, no output. */ d /* output: abc */ I just want to know why? Can somebody help me? THX!

IBM Disk/Memory question

Help!!!! The IBM has got to be one of the stupidest machines ever put into comission! That said, could someone please help me? I am writing a DOS application and want to find out the amount of memory on the system. I thought I would be smart and called INT 12H but that tells me there is a base of 640K on the IBM.... DUH!!! So next I tried calling INT 15H, service 88H, which is supposed to return the # of K of extended memory on a 286 or better, but it returns a 0. Now... I know my machine is a 386 and that it has 4M of RAM installed on it, so what's going on? Can anyone

Any DR filed for 5.1.2.2.1.1: Implementation dependent form of main?

I have seen more confusion than help when interpreting the last part of 5.1.2.2.1.1: [...]or in some other implementation-defined manner. I have searched the archives and seem to understand that experts like Chris Torek consider this a defect. See http://groups.google.com/group/comp.lang.c/msg/c1a1cc0a23af7227 and http://groups.google.com/group/comp.std.c/msg/7340b025f5fe8657 for reference. Questions: 1. Has a DR been filed for this issue? (My efforts at retrieving anything similar from open-std.org failed.) 2. Assuming that such a DR has not been filed, would not it

Some information for the one who decided to learn C++, and now wants to learn at least a bit of C?

Some time ago I decided to learn C++, and most of the documentation I found (books, tutorials, etc) said that not only is it not necessary to learn C before, it is not recommended since it could make things more difficult. Now I know C++, but I deal a lot with various C software, and although I understand it all, it is not at all easy to adapt it to my needs. Where should I search for information? I couldn't find anything useful on Google (and it's not that easy to find a good search query). Could you advise me? Any responses are welcome.

Porting C from Sparc/UNIX to IBM 5000 series

HELP NEEDED ----------- I have the following problem: I have C code generated from an AWk program using awkcc. I need to port this C code to an IBM 5000 series mainframe (MVS). I don't have any idea about IBM mainframes and hence do not know about the various C compilers on IBM. The C code I have is NOT ANSI C - it is old-fashioned K&R C. Any insights on portability is appreciated. Thanks in advance. --------------------

C Containers library

The project is going forward slowly but surely. I am trying to fix the bugs in the standard implementation, improve the specs, eliminate inconsistencies fo the definitions/interface of different containers, etc. The doc is no longer written in Word/Open Office, whatever. I have changed to latex (pdflatex) and the looks have improved a lot. The libraries compile under Macintosh (64 bits), Windows 7 (64 and 32 bits) and linux (64 and 32 bits)

the asm i use is better than C

i wrote a "parser" that could be paste in the source of RosAsm assembler "RosAsm V. 2.050a" in the tab "new parser" the result language for me is better than your C it could be hugly the first time, but afther some routines one understand how it is ok for find it search for post in alt.lang.asm NG 19-7-2010 11.03 for the name io_x there should be a 32.6 kb zip file in that post i don't know if someone add some virus to it but i not wrote any virus in it yes i not have the sure 100% nor i can assure all, all is risky! the life is risky! for the ones argue of portability

compilation error on asking for parameter from stdin

Hello I have a strange problem [strange because I can't understand it]. The following code compiles fine: /* gcc -o p2 -pipe -O2 p2.c */ #include <stdio.h> #include <math.h> int main(){ long fib; int N; double ROOT5 = pow(5.0, 0.5); double COEFF1 = (ROOT5 + 1)/2.0/ROOT5; double COEFF2 = (ROOT5 - 1)/2.0/ROOT5; double BASE1 = (1.0 + ROOT5)/2.0; double BASE2 = (1.0 - ROOT5)/2.0; N = 4; printf("Enter the power: "); //scanf("%d", &N); fib = (long)(COEFF1 * pow(BASE1, N) + COEFF2 * pow(BASE2, N)); printf("%ld\n", fib); return 0; } Howev

Acting on SIGTERM signal under C99

Hello, in C99, the signal handler for a SIGTERM signal is subject to restrictions, including 7.14.1.1#5 If the signal occurs other than as the result of calling the abort or raise function, the behavior is undefined if the signal handler refers to any object with static storage duration other than by assigning a value to an object declared as volatile sig_atomic_t, or the signal handler calls any function in the standard library other than the abort function, the _Exit function, or the signal function with the first argument equal to the signal number correspon

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operator++ execution order differs between scalar types and classes

Hi, Can anyone explain please why gcc (and possibly other compilers too) treats scalar types and classes differently in terms of the order in which their operator++ is executed? For example, the following code: int x(0), y(0); y = x++ + x++; printf("x=%d y=%d\n", x, y); yields output: x=2 y=0 as if the code had been: int x(0), y(0); y = x + x; x++; x++; printf("x=%d y=%d\n", x, y); On the other hand, if I replace 'int' with a class that has all relevant ctors and operators (including operator++) defined: MyIntClass x(0), y(0); y = x++ + x++; printf("x=%d y=%d\n", x, y); the exactly t

Why is scanf such a nightmare to use?

Whenever I try to use scanf I always get into some kind of trouble and revert to strtok or similar finer grain functions. Example: I have this string: 2010/09/02 11:03:57 Test Where the 1st space is a space while the 2nd one is a tab. I want to read it into two substrings, separating at the tab: scanf(Str, "%s\t%s", DateTime, Target); But I end up with: DateTime=2010/09/02 Target=11:03:57 Why ?!? -- Guillaume Dargaud http://www.gdargaud.net/

Compiler error

Recently i'm getting this strange error while trying to compile a binary tree program. gcc -o -Wall wordcount wordcount.c gcc: wordcount: No such file or directory In file included from /usr/include/stdio.h:34, from wordcount.c:8: /usr/lib/gcc/i686-redhat-linux/4.4.4/include/stddef.h:211: error: two or more data types in declaration specifiers /usr/lib/gcc/i686-redhat-linux/4.4.4/include/stddef.h:211: error: two or more data types in declaration specifiers wordcount.c: In function =91talloc=92: wordcount.c:58: warning: incompatible implicit declaration of built-in

Pointer Problem

WANTED: To print the value of the key. GOT: Weired printing on screen Key is the +OK string and its value is separated by a space from it e.g. +OK HTTP_REQUEST I have a full sentence which contains many characters (even newlines) and I want to take out the value of the key from it. Its printing almost a mess. When I print an array it prints fine but if it is passed to another function then it prints mess. #include <stdio.h> #include <string.h> enum { SIZE_ARR = 50 }; int string_copy_till_newline(char dest[], char src[]); int get_pointer_for_value_usin

turning Marsaglia's recent posts into a function

For reasons various and sundry, I want to create a capability to produce a random letter. For a source of randomness, I have used C's rand() and fortran's random_seed. Writing with these functions wouldn't be any fun. Is there someplace on ubuntu that I could draw random ints from? That might not be topical, but what is the following: $ gcc -Wall -Wextra geo1.c -o out geo1.c: In function �MWC�: geo1.c:5: warning: type defaults to �int� in declaration of �c� geo1.c:5: warning: type defaults to �int� in declaration of �j� geo1.c:5: warning: unused variable �i� geo1.c: In f

Three stupid C questions

Hi All, I'm really sorry for the dumbness of my questions but I'm from the TP/Pas world. Before I get enough money to buy to good C/C++ compiler (for DOS/Win/NT, any suggestions :-) ) and start learning C/C++, I need to translate a C prog into TP. Here are the supid questions: 1st: I've got p as a pointer on a CStruct. p = *CStruct. No matter was CStruct is. If the program does 'MyPointer = p++' what does this mean? 1) MyPointer = p; increment p of 1; 2) MyPointer = p; Increment p of SizeOf(CStruct); 3) increment p of 1;

comp/lang.c very special

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Switch statement or array

Good (evening, morning, afternoon) I have the following construct in my program. Some may remember this from the first time I posted on C.L.C. a coupla years ago. Effectively, it's a calendar program. This function takes as arguments the day of the week of the beginning of the year - in my case, the upcoming Jewish New Year - and has to add a certain number of days to get the day of the week on which the first day of any other month falls. (Sorry, I know that's a bit garbled.) I have two ways of doing it. 1) A switch statement: int new_month(int month, int new_year, int leap)

Ping E Sossman

Hi I have been trying to use a utility called getline by E Sossman, distributed on the website for the comp/lang/c forum. My code would not compile, I eventually worked out the strange error messages and the problem is that there is already a function in glibc called getline. I would advise renaming this function in a future version to avoid this clash. Unfortunately C doesn't have proper support for namespaces but you can use a prefix instead, eg rename the function ES_getline and all other globally exported symbols could also start ES_. Cheers Martin

Parentheses in function calls

One possible problem with C as compared to other languages like Perl or Shell is that function calls require parentheses which leads to cluttered code. (But there are some funny exceptions in the standard library though, eg return and size_of do not need parentheses) Why not allow Juxtaposition to denote a functioncall with parentheses only needed to override other laws of precedence? Seems to me it would be easy to implement this and it would lead to cleaner code. Yours Tony

Help with structs

I'm trying to learn C by writing an interpreter for a Scheme-like language in it. I have the following struct which is used for Scheme objects... typedef struct object { object_type type; union { struct { // FIXNUM long value; } fixnum; struct { // FLONUM double value; } flonum; // Other types omitted } data; } object; When I tried to implement + I couldn't figure out how to do it simply and ended up writing this... object *h_numeric_add(object *obj_1, object *o

ITUGLIB update, bash and floss

Hi folks I've just updated bash to the latest patchlevel (4.1.5) and also created the binaries for TNS/R (the first since September 2007!). Bash has support for Guardian DEFINEs built in (first time for the TNS/R version) Packages for TNS/E, TNS/R, src (for NonStop) and diff (to the original source) are now available on ITUGLIB, http://ituglib.connect-community.org/apps/Ituglib/SrchOpenSrcLib.jsf Furthermore I've now placed my latest version of the floss package there, floss-0.9. Only as a src package, as it is needed only when when someone wants to port new software or compile ot

const problem

This program compiles with a warning and of course it is working and running fine: #include <stdio.h> #include <stdlib.h> #include <string.h> enum { VAL_FALSE = 0, VAL_TRUE = 1 }; int array_has_two_newlines_together(const char* s); int main(void) { char arr1[] = "This has 2 newlines together\n\n"; char arr2[] = "This has 2 newlines \n but not together\n"; char arr3[] = "This has only one newline\n"; char arr4[] = "This does not have any newlines"; if(VAL_TRUE == array_has_two_newlines_together(arr1)) { printf("arr1 has 2 newlines