EOF is just a macro with a value (usually -1). You have to test something against EOF, such as the result of a getchar() call. One way to test for the end of a stream is with the feof function. if (feof(stdin)) Note, that the ‘end of stream’ state will only be set after a … Read more
I’m not fully sure that this is what you’re looking for, but if your question is how to read an integer using <stdio.h>, then the proper syntax is int myInt; scanf(“%d”, &myInt); You’ll need to do a lot of error-handling to ensure that this works correctly, of course, but this should be a good start. … Read more
Try setvbuf(stdout, NULL, _IONBF, 0). It changes stdout to unbuffered (_IONBF) mode.
fgetc+ungetc. Maybe something like this: int fpeek(FILE *stream) { int c; c = fgetc(stream); ungetc(c, stream); return c; }
When a variable is defined, the compiler allocates memory for that variable. int i; // The compiler will allocate sizeof(int) bytes for i i defined above is not initialized and have indeterminate value. To write data to that memory location allocated for i, you need to specify the address of the variable. The statement scanf(“%d”, … Read more
Unfortunately, HANDLEs are completely different beasts from FILE*s and file descriptors. The CRT ultimately handles files in terms of HANDLEs and associates those HANDLEs to a file descriptor. Those file descriptors in turn backs the structure pointer by FILE*. Fortunately, there is a section on this MSDN page that describes functions that “provide a way … Read more
To answer the original question: Anything that can be done using stdio can be done using the iostream library. Disadvantages of iostreams: verbose Advantages of iostreams: easy to extend for new non POD types. The step forward the C++ made over C was type safety. iostreams was designed to be explicitly type safe. Thus assignment … Read more
string str,sub; // str is string to search, sub is the substring to search for vector<size_t> positions; // holds all the positions that sub occurs within str size_t pos = str.find(sub, 0); while(pos != string::npos) { positions.push_back(pos); pos = str.find(sub,pos+1); } Edit I misread your post, you said substring, and I assumed you meant you … Read more
is this a keyword or special data type for C to handle files with? What you are refering to is a typedef’d structure used by the standard io library to hold the appropriate data for use of fopen, and its family of functions. Why is it defined as a pointer? With a pointer to a … Read more
Streams in C1 are thread-safe2. Functions are required to lock the stream before accessing it3. The fflush function is thread-safe and may be called from any thread at any time, as long as the stream is an output stream or an update stream4. 1 As per the current standard, which is C11. 2 (Quoted from: … Read more