| I/O manipulators | ||||
| Print functions(C++23) | ||||
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| Buffers | ||||
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(C++23) | ||||
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| Synchronized Output | ||||
(C++20) | ||||
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| Error category interface | ||||
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Defined in header <cstdio> | ||
int feof(std::FILE* stream); | ||
Checks if the end of the given file stream has been reached.
Contents |
| stream | - | the file stream to check |
Nonzero value if the end of the stream has been reached, otherwise0.
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 astd::fgetc, which returned the last byte of a file,std::feof returns zero. The nextstd::fgetc fails and changes the stream state toend-of-file. Only thenstd::feof returns non-zero.
In typical usage, input stream processing stops on any error;feof andstd::ferror are then used to distinguish between different error conditions.
#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 EOFwhile((c=std::fgetc(fp))!=EOF)// Standard C I/O file reading loopstd::putchar(c); if(std::ferror(fp))std::puts("I/O error when reading");elseif(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
| checks if end-of-file has been reached (public member function of std::basic_ios<CharT,Traits>)[edit] | |
| clears errors (function)[edit] | |
| displays a character string corresponding of the current error tostderr (function)[edit] | |
| checks for a file error (function)[edit] | |
C documentation forfeof | |
