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This article mainly explains "what are the operation methods of C language files". The content of the explanation in this article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought. Let's study and learn "what are the operation methods of C language files"?

Sequential read-write character input and output fgetc and fputc of files

Fgetc: the character input function, that is, the function used to read the file.

Function function: Read a character from a stream

Read a character from a file into memory.

Function prototype:

Int fgetc (FILE * stream)

The parameter is stream, which is the file pointer.

Return value: fgetc return the character read as an int or return EOF to indicate an error or end of file. A successful call to this function returns the ASCIIC code value of the character read; if an error occurs while reading the file, or if it has been read to the end of the file, EOF is returned.

For example: read and print the contents of the data.txt file.

# include # include # include int main () {/ / Open the file FILE* pf = fopen ("data.txt", "r"); if (pf = = NULL) {printf ("% s\ n", strerror (errno)); return 0 / / failed to open the file and returned} / / A pair of file input characters int ch = 0; while ((ch = fgetc (pf))! = EOF) {printf ("% c", ch);} / / close the file fclose (pf); pf = NULL; return 0;}

Fputc:

Function function: write a character from memory to the file. That is, the output character.

Function prototype:

Int fputc (int c, FILE * stream)

The first parameter is the character to be output, and the second parameter is the file pointer.

Return value: Each of these functions returns the character written. For fputc, a return value of EOF indicates an error.

This character is returned if it is running normally, and it fails if EOF is returned.

For example: write the letter aasthz to the data.txt file

# include # include # include int main () {/ / Open the file FILE* pf = fopen ("data.txt", "w"); / / failed to open the file and returned if (pf = = NULL) {printf ("% s\ n", strerror (errno)); return 0 } / / A pair of files to output characters char I = 0; for (I ='a character; I

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