Defined in header <stdio.h> | ||
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int fgetc( FILE *stream ); | (1) | |
int getc( FILE *stream ); | (2) |
fgetc, except that if getc is implemented as a macro, it may evaluate stream more than once, so the corresponding argument should never be an expression with side effects.| stream | - | to read the character from |
On success, returns the obtained character as an unsigned char converted to an int. On failure, returns EOF.
If the failure has been caused by end-of-file condition, additionally sets the eof indicator (see feof()) on stream. If the failure has been caused by some other error, sets the error indicator (see ferror()) on stream.
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
const char* fname = "/tmp/unique_name.txt"; // or tmpnam(NULL);
int is_ok = EXIT_FAILURE;
FILE* fp = fopen(fname, "w+");
if (!fp) {
perror("File opening failed");
return is_ok;
}
fputs("Hello, world!\n", fp);
rewind(fp);
int c; // note: int, not char, required to handle EOF
while ((c = fgetc(fp)) != EOF) // standard C I/O file reading loop
putchar(c);
if (ferror(fp))
puts("I/O error when reading");
else if (feof(fp)) {
puts("End of file is reached successfully");
is_ok = EXIT_SUCCESS;
}
fclose(fp);
remove(fname);
return is_ok;
}Possible output:
Hello, world! End of file is reached successfully
reads a character from stdin (function) |
|
|
(removed in C11)(C11) | reads a character string from stdin (function) |
| writes a character to a file stream (function) |
|
| puts a character back into a file stream (function) |
|
C++ documentation for fgetc, getc |
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