File I/O : C Language Tutorial

fopen - open a file
fclose - close an open file
fread - read from a file
fwrite - write to a file
fseek/fsetpos - move a file pointer to somewhere in a file.
ftell/fgetpos - file pointer location.

To open a file you need to use the fopen function, which returns a FILE pointer as stated above. fclose returns zero if the file is closed properly.

Example:- FILE *fp; fp=fopen("c:\\new.txt", "w"); fprintf(fp, "New.\n");

Simple C Program to see how file handling works

Input File

Output File

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