Creating a file

 Creating (or) Opening a file

To create a new file or open an existing file, we need to create a file pointer of FILE type. Following is the sample code for creating file pointer.

File *f_ptr ;

We use the predefined method fopen() to create new file or to open an existing file.

There are different modes in which a file can be opened. 

Consider the following code... 

File *f_ptr ;

*f_ptr = fopen("abc.txt", "w") ; 

The above example code creates a new file called abc.txt if it does not exists otherwise it is opened in writing mode.

fopen is a standard function which is used to open a file.

• If the file is not present on the system, then it is created and then opened.
• If a file is already present on the system, then it is directly opened using this function.

fp is a file pointer which points to the type file.

 

In C programming language, there different modes are available to open a file and they are shown in the following table.

 

 

Example

#include <stdio.h>
int main() {
FILE *fp;
fp  = fopen ("D://data.txt", "w");
}