std::feof
From cppreference.com
| Defined in header <cstdio>
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| int feof( std::FILE* stream ); |
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Checks if the end of the given file stream has been reached.
Parameters
| stream | - | the file stream to check |
Return value
Nonzero value if the end of the stream has been reached, otherwise 0.
Notes
This function only reports the stream state as reported by the most recent I/O operation, it does not examine the associated data source. For example, if the most recent I/O was a std::fgetc, which returned the last byte of a file, std::feof returns zero. The next std::fgetc fails and changes the stream state to end-of-file. Only then std::feof returns non-zero.
In typical usage, input stream processing stops on any error; feof and std::ferror are then used to distinguish between different error conditions.
Example
Run this code
#include <cstdio> #include <cstdlib> int main() { FILE* fp = std::fopen("test.txt", "r"); if(!fp) { std::perror("File opening failed"); return EXIT_FAILURE; } int c; // note: int, not char, required to handle EOF while ((c = std::fgetc(fp)) != EOF) { // standard C I/O file reading loop std::putchar(c); } if (std::ferror(fp)) std::puts("I/O error when reading"); else if (std::feof(fp)) std::puts("End of file reached successfully"); std::fclose(fp); }
See also
| checks if end-of-file has been reached (public member function of std::basic_ios<CharT,Traits>) | |
| clears errors (function) | |
| displays a character string corresponding of the current error to stderr (function) | |
| checks for a file error (function) |