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Hàm Cin.eof() trong C++ – programming – Dạy Nhau Học
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- Summary of article content: Articles about Hàm Cin.eof() trong C++ – programming – Dạy Nhau Học Mọi người cho em hỏi hàm Cin.eof() hoạt động như thế nào. Em đọc bài của anh Đạt tới đoạn này thì hàm này đều trả về kq là 0, dù em nhập ntn … …
- Most searched keywords: Whether you are looking for Hàm Cin.eof() trong C++ – programming – Dạy Nhau Học Mọi người cho em hỏi hàm Cin.eof() hoạt động như thế nào. Em đọc bài của anh Đạt tới đoạn này thì hàm này đều trả về kq là 0, dù em nhập ntn … Mọi người cho em hỏi hàm Cin.eof() hoạt động như thế nào.
Em đọc bài của anh Đạt tới đoạn này thì hàm này đều trả về kq là 0, dù em nhập ntn cũng vậy. Cám ơn anh chị.
Đây là link bài viết của anh Đạt. https://cpp.daynh… - Table of Contents:
c++ – cin.eof() functionality – Stack Overflow
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- Summary of article content: Articles about c++ – cin.eof() functionality – Stack Overflow cin.eof() test if the stream has reached end of file which happens if you type something like … …
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Cách đọc cho đến khi EOF từ cin trong C ++?
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- Summary of article content: Articles about Cách đọc cho đến khi EOF từ cin trong C ++? Bạn có thể chỉ định một ký tự kết thúc thay thế, nhưng EOF không phải … the stream to a string std::istream_iterator
it(std::cin); … … - Most searched keywords: Whether you are looking for Cách đọc cho đến khi EOF từ cin trong C ++? Bạn có thể chỉ định một ký tự kết thúc thay thế, nhưng EOF không phải … the stream to a string std::istream_iterator
it(std::cin); … Tôi đang mã hóa một chương trình đọc dữ liệu trực tiếp từ đầu vào của người dùng và đang tự hỏi làm thế nào tôi (không có vòng lặp) có thể đọc tất cả dữ liệu cho đến khi EOF từ đầu vào tiêu…c++,input,iostream - Table of Contents:
[C++] Confused about using (!cin.eof()) : learnprogramming
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- Summary of article content: Articles about [C++] Confused about using (!cin.eof()) : learnprogramming eof() is a boolean method belonging to the istream , which cin is an instance of. It returns true if the istream is at the end of the file (hence, eof), … …
- Most searched keywords: Whether you are looking for [C++] Confused about using (!cin.eof()) : learnprogramming eof() is a boolean method belonging to the istream , which cin is an instance of. It returns true if the istream is at the end of the file (hence, eof), … 10 votes, 11 comments. The teacher in my programming class uses (!cin.eof()) in his code a lot but for some reason i just cant seem to understand …
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More Supplementary Lecture Notes – cin.fail(), cin.clear(), cin.eof() and strchr()
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- Summary of article content: Articles about More Supplementary Lecture Notes – cin.fail(), cin.clear(), cin.eof() and strchr() 1. cin.fail() and cin.eof(). Part of C++ input processing is the function cin.fail(). This returns non-zero (true) if the last cin command failed, … …
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More Supplementary Lecture Notes – cinfail() cinclear() cineof() and strchr()
James S Plank
1 cinfail() and cineof()
2 strchr() to check for one of a bunch of characters
The C++ cin.get(), cin.eof() and cout.put() methods and end-of-file (EOF) controls code example
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- Summary of article content: Articles about The C++ cin.get(), cin.eof() and cout.put() methods and end-of-file (EOF) controls code example The C++ cin.get(), cin.eof() and cout.put() methods and end-of-file (EOF) controls code example. Compiler: Visual C++ Express Edition 2005. …
- Most searched keywords: Whether you are looking for The C++ cin.get(), cin.eof() and cout.put() methods and end-of-file (EOF) controls code example The C++ cin.get(), cin.eof() and cout.put() methods and end-of-file (EOF) controls code example. Compiler: Visual C++ Express Edition 2005. information security, data recovery, data mining security, secure DAQ, online data transfer, online claim, seo technology, online marketing, cloud hosting services, big data analytics, green energy solutionsHow to read from standard input, write to standard output and control the end-of-file in C++ programming
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eof | Microsoft Docs
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- Summary of article content: Articles about eof | Microsoft Docs Learn more about: eof. … The Microsoft-specific function name eof is a deprecated alias for the _eof function. By default, it generates … …
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Why does my input seem to process past the end of file?, C++ FAQ
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- Summary of article content: Articles about Why does my input seem to process past the end of file?, C++ FAQ That is, reading the last byte from a file might not set the eof state. E.g., suppose the input stream … int i = 0; while (! std::cin.eof()) { // WRONG! …
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Phân biệt EOF(), foef() và cin.eof()
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C++ Primer Plus – Stephen Prata – Google Sách
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cin.eof() functionality
For an input stream to enter the EOF state you have to actually make an attempt to read past the end of stream. I.e. it is not enough to reach the end-of-stream location in the stream, it is necessary to actually try to read a character past the end. This attempt will result in EOF state being activated, which in turn will make cin.eof() return true.
However, in your case you are not only not doing that, you (most likely) are not even reaching the end of stream. If you input your 10 from the keyboard, you probably finished the input by pressing the [Enter] key. This resulted in a new-line character being added to the input stream. So, what you are actually parsing with >> operator in this case is actually a 10
sequence. Since you requested an int value from the stream, it only reads the numerical characters from the stream, i.e. it reads 1 and 0 , but it stops at
. That
remains in the stream. You never read it. So, obviously, your code never reaches the end-of-file position in the stream. You have to reason to expect cin.eof() to become true in such case.
cin.fail(), cin.clear(), cin.eof() and strchr()
More Supplementary Lecture Notes – cin.fail(), cin.clear(), cin.eof() and strchr() James S. Plank
1. cin.fail() and cin.eof()
#include
using namespace std; int main() { string s; int i; i = 0; while (1) { i++; cin >> s; if (cin.fail()) return 0; cout << "String " << i << ": " << s << endl; } } You'll note, when you run this, it ends when the end of the file has been reached, because cin.fail() returns true here: UNIX> g++ cinfail.cpp UNIX> cat input-1.txt Cats foot iron claw Neuro-surgeons scream for more At paranoias poison door. 21st century schizoid man. UNIX> a.out < input-1.txt String 1: Cats String 2: foot String 3: iron String 4: claw String 5: Neuro-surgeons String 6: scream String 7: for String 8: more String 9: At String 10: paranoias String 11: poison String 12: door. String 13: 21st String 14: century String 15: schizoid String 16: man. UNIX> #include
using namespace std; int main() { int j; int i; i = 0; while (1) { i++; cin >> j; if (cin.fail()) return 0; cout << "Integer " << i << ": " << j << endl; } } When we run it on input-2.txt, you see that it quits after reading the seventh word, because that is not an integer: UNIX> g++ cinfail2.cpp UNIX> cat input-2.txt 30 40 50 60 70 -100 Fred 99 88 77 66 UNIX> a.out < input-2.txt Integer 1: 30 Integer 2: 40 Integer 3: 50 Integer 4: 60 Integer 5: 70 Integer 6: -100 UNIX> #include
using namespace std; int main() { int j; int i; string dummy; i = 0; while (1) { cin >> j; if (!cin.fail()) { i++; cout << "Integer " << i << ": " << j << endl; } else if (cin.eof()) { return 0; } else { cin.clear(); cin >> dummy; } } } When we run it on input-3.txt, you see that it works as promised:
UNIX> g++ cinfail3.cpp UNIX> cat input-3.txt Black 100 as 50 a 25 dark 12 night -5 she 0 was -500 UNIX> a.out < input-3.txt Integer 1: 100 Integer 2: 50 Integer 3: 25 Integer 4: 12 Integer 5: -5 Integer 6: 0 Integer 7: -500 UNIX>
2. strchr() to check for one of a bunch of characters
if (strchr(“0Ab.:/”, c) != NULL)
For example, suppose we want to write a program that has the user enter a card by typing the rank and the suit, like “AH” for the ace of hearts, and “2C” for the two of clubs. Here’s a way to do it (in readcard.cpp):
#include
#include using namespace std; const char *ranks = “23456789TJQKA”; const char *suits = “CDHS”; const char *longranks[13] = { “Two”, “Three”, “Four”, “Five”, “Six”, “Seven”, “Eight”, “Nine”, “Ten”, “Jack”, “Queen”, “King”, “Ace” }; const char *longsuits[4] = { “Clubs”, “Diamonds”, “Hearts”, “Spades” }; int main() { string s; const char *str; int cnum; while (1) { cout << "Enter a card: "; cin >> s; str = s.c_str(); if (strlen(str) != 2) { cout << "The card must the format 'rank-suit', such as 'AH' or '2C' "; } else if (strchr(ranks, str[0]) == NULL) { cout << "The rank must be one of " << ranks << endl; } else if (strchr(suits, str[1]) == NULL) { cout << "The suit must be one of " << suits << endl; } else { cnum = (strchr(suits, str[1]) - suits)*13 + (strchr(ranks, str[0]) - ranks); cout << "Good card: #" << cnum << ": The " << longranks[cnum%13] << " of " << longsuits[cnum/13] << ". "; } } } Note the use of pointer arithmetic to get the rank and suit. Study that one carefully. It's a good trick to know. Here's an example of it running: UNIX> g++ readcard.cpp UNIX> a.out Enter a card: AH Good card: #38: The Ace of Hearts. Enter a card: 2C Good card: #0: The Two of Clubs. Enter a card: 7S Good card: #44: The Seven of Spades. Enter a card: TD Good card: #21: The Ten of Diamonds. Enter a card: YS The rank must be one of 23456789TJQKA Enter a card: TY The suit must be one of CDHS Enter a card: Fred The card must the format ‘rank-suit’, such as ‘AH’ or ‘2C’ Enter a card: ^C UNIX>
The C++ cin.get(), cin.eof() and cout.put() methods and end-of-file (EOF) controls code example
The C++ cin.get(), cin.eof() and cout.put() methods and end-of-file (EOF) controls code example
Compiler: Visual C++ Express Edition 2005
Compiled on Platform: Windows XP Pro SP2
Header file: Standard
Additional library: none/default
Additional project setting: Set project to be compiled as C++
Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)
Other info: none
To do: Reading from standard input, writing to standard output and controlling the end-of-file C++ programming
To show: How to read from standard input, write to standard output and control the end-of-file in C++ programming
// end of file controls depend on the system
// Ctrl-z followed by return key – IBM PC
// Ctrl-d – UNIX and MAC
#include
using namespace std;
void main(void)
{
char p;
cout <<"Using member functions get(), eof() and put() " <<"---------------------------------------------"<
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