File operation in C programming(text file method)

There are two type file operation. One is using text file method and another one using binary file method. The method is for text file method.

First step is to define

FILE *
example :
FILE *ifile;
FILE *book;

Then to open a text file in c programming

function : fopen()
format : fopen("filename",mode);
mode:
"r" = read only
"w" = write only(start from beginning file-replace all previous data)
"a" = write only(start at end file- if got data in the data, it will not be replace)
"r+" = open to update the data(read and write)
"w+"= open to update the data(create,read and write)

example
fopen("book.txt","w");
fopen("new/inputfile.text","r");

note: only one mode in one fopen statement. cannot use"rw". can open a file to write and to read but once open to read must close it first to reopen for write operation.

To write to the text data

function : fprintf()
format : fprintf(FILE *,"",);
example:
fprintf(FILE *ifile, "%d\n", int data);
fprintf(FILE *book,"%c\n", char books);

To read from text file

function: fscanf()
format: fscanf(FILE *,"",);
example:
fscanf(FILE *ifile, "%d\n", int data);
fscanf(FILE *book,"%c\n", char books);

To close the text file

function : fclose()
format: fclose(FILE *);
example:
fclose(ifile);
fclose(book);

Full sequence in a main function

void main()
{
FILE *ifile;
FILE *book;
char books[10];
int data;

fopen("/new/inputfile.text","r");
fopen("book.txt","w");

fscanf(ifile, "%d\n",data);

fprintf(book,"%c\n",books);

fclose(ifile);
fclose(book);

return;
}