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std::feof(3) C++ Standard Libary std::feof(3) NAME std::feof - std::feof Synopsis Defined in header <cstdio> int feof( std::FILE* stream ); 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 exam- ple, 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() { int is_ok = EXIT_FAILURE; FILE* fp = std::fopen("/tmp/test.txt", "w+"); if(!fp) { std::perror("File opening failed"); return is_ok; } int c; // note: int, not char, required to handle EOF while ((c = std::fgetc(fp)) != EOF) { // standard C I/O file read- ing 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"); is_ok = EXIT_SUCCESS; } std::fclose(fp); return is_ok; } Output: End of file reached successfully See also eof checks if end-of-file has been reached (public member function of std::basic_ios<CharT,Traits>) clearerr clears errors (function) perror displays a character string corresponding of the current error to stderr (function) ferror checks for a file error (function) http://cppreference.com 2022.07.31 std::feof(3)
NAME | Synopsis | Parameters | Return value | Notes | Example | Output: | See also
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