The experiment I am currently working uses a software base with a complicated source history and no well defined license. It would be a considerable amount of work to rationalize things ... |
Is there an easy way to check if a line is empty. So i want to check if it contains any white space such as \r\n\t and spaces.
Thanks
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I am using the getline() function in C and it keeps giving me seg faults when I use it more that once, as in for an array. Here is how I've ... |
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I'm working with a file. I want to write a code that returns a particular string located somewhere in the file. I have the starting position of the desired string and it's length so I thought that i can use getline. but i'm not sure how to do that.For using get line can i use the position of the pointer of ... |
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hi, i'm using code like this string s while(getline(cin,s)){ process(s); } // this is the last line process(s); process does some replacement and rescanning. The problem is i can't strip or add newlines. So i don't know whether the lastline contains a '\n' or it was just EOF. I can't read the whole buffer as it is too huge and some ... |
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I am learning malloc() and realloc() and I got the code from here: http://www.eskimo.com/~scs/cclass/notes/sx11c.html #include #include enum MAXSIZE { ARRSIZE = 1000 }; int main( void ) { char line_of_chars[ARRSIZE]; int *ip; int nallocs, nitems; nallocs = 100; ip = malloc(nallocs * sizeof( int )); if( ip == NULL ) { fprintf( stderr, "out of memory\n"); exit(EXIT_FAILURE); } nitems ... |
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I have a text file with mixed carriage returns ('\n' and '\r\n'). On Linux, both the std::string getline() global function and the std::iostream getline() member function are keeping some of the newlines in the result (I suspect they look only for the '\n'). * Is there a quick way I can tell either function to gobble up both Windows-style and Unix-style ... |
Hi, I am reading out a text fileusing following lines: [C++] ifstream ifs (RECORD_FILE, ifstream::in ); while( getline(ifs,recordStr) ) { // while until file is empty cout << "Read from file: " << recordStr << endl; recordStrQueue.push(recordStr); // push the read line into the queue } ifs.close(); [/C++] Now i would like to delete the line in the file as soon ... |
check it at http://rabbit.eng.miami.edu/info/functions/errors.html Arul, Thanks for that page. It looks like it could be invaluable in the future. I tested the errno value and it was reported as being 2 (file/directory not found). I thought that was a little odd as obviously the previous line checks to see if the file was opened succesfully. Therefore I tried resetting the errno ... |
if you have a string str="welcome to thescripts\nc++,c"; and another string str2; if you used the function getline(str,str2) str2 will be "welcome to the scripts" (not including the '\n'. if you want to use cin in the getline function you just put it in the first parameter. good luck and i hope i was helpful |
Hi, I am trying to read two string, one after another, and before I read the second one I clean the buffer using cout.flush(), but I don't know why the program does not read the second string, not even the the third value using cin, Please I need your help. . . . . . this is the program: #include #include ... |
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Why do you need to tell cin to stop blocking? You have 2 threads, one blocks on cin and the other does its work. As long as the blocking cin thread doesn't stop the whole process (it shouldn't) and the other thread does not need to access cin, you should have no deadlock issues. You should be able to interrupt a ... |
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P: n/a Rosario do you like the "GetLine_m" function i have written today? How many errors do you see? i have try only the option for to load the all [text] file in a string not the option to load a line "\n" ended so it should be full of errors [but because i have the "len" i can load with ... |
There are 2 things I see wrong with this code: 1) You're outputting the contents of scores before you give them any values, so this is going to clutter up your output screen with garbage values. 2) You're using a mixture of getline and cin >> statements, which always leads to the following problem: When cin is inputting normally (i.e. cin ... |
Friar Tuck I believe I have found a bug in Dr Sosman's getline_test program, which is one of the official newsgroup programs. Debugging information follows. $ gdb ./getline_test GNU gdb 6.3 Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under ... |
Hi, How do i use stringstreams getline function to extract lines from an existing string? Say i have: string strlist = "line1\r\nLine2\r\nLine3\r\n"; I want to extract each line out into a vector array of strings, but i cant get stringstream working :( This is the sort of code i have tried: // istream& getline (char* s, streamsize n ) stringstream MyStream; ... |
If you put 20 characters on the standard input buffer and then ask for only 9 of those characters then you have 20-9 characters left on the buffer. So the next time you ask for 9 more characters you are getting 9 more from the original 20-9. If you want the buffer to be clear each time after you call a ... |
i m using cin.getline() to input names of objetcs of a class... i am using dynamic number of objects but durn my loop to input names of different object(char* name is a member of this class) for the first time everythn is OK but for successive times it is by passin the cin.getline() but excutin othr commands.... a schematic sketch of ... |
Hi, I have a program where I read a lot of user data. How can I handle the case where the user press control-d ? Is it possible to disable control-d or re-open the cin ? I have made a small example which hopefully shows my problem. Regards Martin #include #include int main() { std::string command; while (true) { ... |
use dynamically allocated char streams... streamsize n =0; //u can substitute streamsize by int/long as u like cout<<"ENTER MAXIMUM ALLOWED CHARECTERS :"; cin>>n; char* some_string =new char; cin.getline(some_string, n); // the 3rd parameter delimiter is optional code.... delete some_string; // relesing memory ro free store some_string =0; u can even bypass this limitation f specifyn the streamsize beforehand but thn u ... |
Hello, I am new at computer programming and I am having trouble using getline() in C. I use an input file that contains 12 variables on every line. From the printf statements below, I notice that scanf, although risky, does the job correctly. However, getline skips the first line from the input file and evaluates the last line twice. Do you ... |
Hey, first of all sorry for my bad english, but I'm from Germany I found something special in the getline() function, I don't understand. If I use the getline function in case of an Excel-sheet or an image - to get the image-data - the getline function breakes after a NULL termination ( \0 ) fstream oFile_e; oFile_e.open("BAB.xls",ios::in); oFile_e.getline(chTest, 100,'\n'); BAB.xls ... |
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Chris std::string randomStuff; std::getline(std::cin, randomStuff); > works on unix, but on windows, it requires the user to hit the enter key *twice* before it continues past the getline. I tried changing the getline to > std::getline(std::cin, randomStuff, '\n'); > but that didn't help. Any ideas? Please post a complete and minimal ... |
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hi, im new here... um, this code works except that, at the end of the loop, i always get a "Segmentation fault". Can anyone help me on this? using GNU C: ..... FILE *fp; fp = fopen("./prg.c", "r"); char *line; int x=1; int nbytes = 100; while(getline( &line, &nbytes, fp ) != -1) { printf("%d: %s", x, line ); x++; } ... |
Can someone explain me getline() and copy() ? I've tried to read and read it again but I can't understand it. This is a code from "The C Programming Language, Kernighan and Ritchie" Code: #include #define MAXLINE 1000 /* maximum input line lenght */ int getline(char line[], int maxline); void copy(char to[], char from[]); /* print the longest input line ... |
First of all, I'd like to tell you all I'm not an experienced C programmer in particular... But I do my best (: So here is my situation: as a way to learn how programming networking applications work, I'm writing this little client/server-based chat program. It is already starting to look like something. However, I can't get one thing to work ... |
Code: #include #define MAXLINE 1000 int getline(char line[], int maxline); void copy(char to[], char from[]); int main(){ int len; int max; char line[MAXLINE]; char longest[MAXLINE]; max = 0; while((len = getline(line, MAXLINE)) > 0){ if(len > max) { max = len; copy(longest, line); } if(max > 0){ printf("%s", longest); } } return 0; } int getline(char s[], int lim[]){ int ... |
#include #include #include int getline_program(char *buffer,int num) { fgets(buffer,num,stdin); return strlen(buffer)-1; } void save_it(char *buffer,char *buffer1) { int i,x; for(i=0,x=0 ; buffer[i]=buffer1[x] ; i++ ,x++); } int main(void) { char name[100]; char *buffer; int x,longest,swap; buffer=malloc(sizeof (char)*100); for(;;){ x=getline_program(name,sizeof name); save_it(buffer,name); longest=x; swap=longest; printf("x=%d\t longest=%d\n %d\n",x,longest,swap); if(x>longest) { puts("its longer: preforming functions\n"); free(buffer); buffer=malloc(sizeof (char)*100); longest=x; save_it(buffer,name); printf("Your ... |
36. getline error cboard.cprogramming.comCode: int main(int argc, char *argv[]){ char* tester = "makefile"; char* tester1 = "Makefile"; if (argc == 1){ fprintf(stderr, "memake: *** No targets specified and no makefile found. Stop.\n"); return 2; } else if (strcmp(argv[1], tester) == 0 || strcmp(argv[1], tester1) == 0){ char* file_to_read = argv[1]; FILE* fr = fopen(file_to_read, "w"); if (fr == NULL){ fprintf(stderr, "%s: trying to open ... |
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i have two problems actually: 1) in c++, you can use the 'getline' function to read in a line that is terminated with a specified delimiter..is this at all possible in c? I am assuming that i'd have to create a loop and use getc (this is all reading input in from a file). 2) this line of code does not ... |
40. getline in C? cboard.cprogramming.comThanks for all your help on this board I really appreciate it and before I begin Im only asking/making some comments. Im not here to argue, fight, or anger anyone. I just want to say a few things on the silent n00bs behalf. SOME of us do read books, search boards, and are very interested in really learning this stuff we ... |
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42. Getline help cboard.cprogramming.comThe code as of now is: #include char * getstring(char * string,int max_chars) { char responce; char * pstring; pstring = string; int number; while ((responce = getchar()) != '\n') { if (number < max_chars) { *pstring++ = responce; number++; continue; } else { break; } } *pstring = '\0'; return string; } int main(void) { char ff[10]; getstring(ff,10); puts(ff); ... |
When i write this code it does not take anything for input for the original string and automatically goes to the next cin... void substring() { //declare variables string str; int b, length; //taking input from user(keyboad) getline(cin,str); cout << " Enter beginning position : "; cin >> b; cout << " Enter length of substring : "; cin >> length; ... |
Original - c++ Code #include #include using namespace std; //Return the ending result in a file double lastResult() { double Line=0; ifstream MyFile("Session.txt"); while (!MyFile.eof()) { MyFile>>Line; } return Line; } //Write to the end of a file void writeFile(string Input) { ofstream myfile("Session.txt",ios::app); myfile << Input << endl; } //Clear text on screen void clearScreen() { for (int ... |
CIN getline problem and ignore statement Code: #include #include //getch() header file #include #include using namespace std; //-------------------------------------------------------- struct courseSection{ char sectionNumber[6]; //first 3 character, last 3 digit char startTime[6]; char startDate[10]; char roomNumber[4]; // char courseNo[6]; courseSection *next; }*startCourseSection=NULL; //------------------------------------------------------- struct course{ char courseNumber[7]; char title[20]; char creditHours[10]; course *next; }*startCourse=NULL; //-------------------------------------------------------- struct student{ int studentID; ... |
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47. Getline() forums.devshed.comDoes anybody know what: getline(cout, business); does? The text I am reading has it in an example but yet no explanation of it. There are other forms of it with which I am familiar when taking input from the user and getting the whole line up to /n. However, this? I'm not sure... thx PS - How do I respond to ... |
I am beginning to learn to program in C.* In one of the tutorials that I am reading it says that when doing I/O you should use getline and getdelim.* It says that these are GNU extensions?* It also says that using other I/O functions is not as safe; such as gets().* The problem I have is that in the other ... |
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Oh sorry, I think I see it now. Check the docs for the getline() function. Bet it stops inputing data when it reaches the specified end-of-line character. That means you never get to the end of file if there is new-line character at the end of the first line of text. You need to check the ruturn value from getline() and ... |
Hey guys, I done a bit of C++ for college when I was there, so I thought I would take it up again to see if I could still make a wee program with it (not that it does anything much ). Everything seems to be going well with it, but there is one thing that has been bothering me. When ... |
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53. getline fn forums.devshed.comi almost have my roman to numeral prog sorted out. the last thing i need is to get rid of an input1 error. Code: int FindNumberOne () { char input1; float value1 = 0.0; cin.get(input1); while ( intput1 != '\n') { if ( input1 == 'M' ) value1 = value1 + 1000; else if ( input1 == 'D' ) value1 = ... |
54. getline() forums.devshed.comlong videoNum; char videoName[1]; cout << " -- Current Record -- " << endl; cout << " What is the Video Number?: "; cin.getline (videoNum, EOF); cout << " What is the Video Name?: "; cin.getline (videoName, EOF); cout << " -- New Record -- " << endl; cout << " What is the Video Number?: "; cin >> videoNum2; cout ... |
Nellie, you say this doesn't work and that doesn't work, but one always has to pry your code out of you in order to have a look and see what's wrong. Please re-read the post for new users regarding tips about how to ask questions. Actually, it revolves around providing information, as information is the source of knowledge. |
Hi, everyone I don't get any warning or error. I'm using Visual Studio.net The problem I have with this program is that when I run it, It automatically skips first cin.getline function.( cin.getline (name,256) so I choose 1 when I run the program then the following happens Enter your name: Enter your favourite movie: (then wait for responce from keyboard) I ... |
You can read the data into a string. There is more than one 'getline.' I recommend the string class overloaded one for strings. Refer to your documentation for correct usage. I would suggest that advising your user to make sure he/she names the correct file is no substitute for checking the open operation to ensure it succeeded prior to making an ... |
problem solved, I've been tearing my hair out for over 12 hours on this one, I'm indebted! Thanks a million. The reason I'm mixing getch() with iostream stuff is because I'm a student who's only been doing c++ for 3 months, and programming lecturers seem to be notoriously bad. This is the last c++ project I'll ever have to do, too. ... |
#include using namespace std; int main() { char *name = new char[26]; // this zeros out the newly allocated memory on my system but it should not be assumed to do so everywhere name[0] = 0; // make sure strlen calculates to < 1 the first time while (strlen(name) < 1) { cout << "Enter your name: "; cin.getline(name, 25); ... |
I realize it's a new concept that hasn't been mentioned in the forum before, but if it were me and I were puzzled about my input failures, my code would have a number of calls following the getline statement to the various functions which reveal the status (good, bad, et al) of the stream. |
I would've thought that a getline() would wait for some form of input from the keyboard in all cases, but apparently this isn't true. When I use a getline(), not inside of some sort of looping structure, it works fine. The problem is that when it's inside some sort of control structure the program doesn't wait for some sort of input. ... |
Hey everyone! I've been pulling my hair out over this problem for the past hour.. I've used getline before but this time something is up.. here is a snippet of my code: cout << "Please type a yes/no question that will distinguish a "; cout << correct_animal << " from a " << guess_animal << "."; cout << "Your question: "; ... |
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Hi, I am unable to make the function getline(cin, text) work correctly. In Ivor Horton's Beginning C++(p.206), he says the function is declared in the string header file and will read in a line of input from cin up to the point when a newline character is read. I find that after I enter some text and hit return, the cursor ... |
having problems reading in white space using getline.. Getting lots of garbage when displaying them to screen. Here is data file i used. 34 Paul Smith West Seneca 54 Rick Smith East Side Code: #include #include #include #include void main() { int employee; char name[50]; char city[50]; ifstream infile; ofstream outfile; infile.open("data.txt"); while ... |
I have been writing a simple calender program to test out my knowledge of C++ so far. If you could compile the code below, you'll see the problem that I'm having. It's very, very strange and anyone who would correspond would be welcome. #include #include #include using namespace std; enum evenodd { EVEN, ODD }; int numofdays; int ... |
I'm having a problem parsing information stored in the buffer after a getline command. I have a file with data in the format: 1310 76102 C 5 27 2011 6 26 2011 5 R R 8.00 20.00 F R 8.00 25.00 150 165 I would separate everything using white space as a delimiter, but the information isn't always the same. i.e. ... |
#include #include #include #include #define _GNU_SOURCE #include #include #include #include #include #include #include #include //********************************************************************************************************* void Help(const char* program_name) { printf("\n\t*************HELP*************\n"); printf("(C) Juraj Stefanicka\n"); printf("\nTento program sluzi na rekurzivne prehladavanie adresarovej strukturi zadanej argumentom programu.\n"); printf("\nSpustanie programu: \n\t%s [-c | --count] []\n\n", program_name); printf("Ak nezadate ziadny prepinac program vypise ... |
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#include #include # define NEWLINE '\n' int main() { static const char filename[] = "Bond.in.txt"; FILE *file = fopen(filename, "r"); if ( file != NULL ) { char line [ 200 ]; while ( fgets ( line, sizeof line, file ) != NULL ) /* read a line */ { fputs ( line, stdout ); /* write the line ... |
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This is C code, not C++. That makes things a lot more complicated. If you were using C++, I'm sure there would be CSV parsing classes you could use. The rule is simple, you look for commas that are outside quotes. You could write an iostreams reader to do that for you, for example, and change the delimiter as it goes. ... |
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Why doesn't this program allow me to input anything into name? Am I misusing cin.getline()? Is there a more effective way to accomplish what I am trying to do here? #include #include struct database{ int integer; char name[50]; char notes[200];} record[100]; void main(){cout << "Enter an integer: ... |
Hi,I'm having trouble getting getline to work. Keeps giving me segmentation faults. I have made a short program to debug what I'm doing wrong. This code is also giving me segmentation faults.Can some tell me what I'm doing wrong? Attached is the code:#include main(){ char *cptr = (char *) malloc(sizeof(char)); getline(cptr,10,stdin);}Thanks in advance |