Read and write mode of opening file in c

There are two other streams i. Say we have another program called greet , similar to helloworld , that greets you with a given name :. The above methods only worked for the most basic of cases. If you wanted to do bigger and better things, you will probably want to work with files from within C instead of through the shell. To accomplish this, you will use a function called fopen. This function takes two string parameters, the first being the file name and the second being the mode.

The mode are basically permissions, so r for read, w for write, a for append. You can also combine them, so rw would mean you could read and write to the file. If the file does not exist, it will be created. If the file is opened successfully fopen loads it into memory and sets up a pointer that points to the last character in it. Data is added to the end of the file. If is opened successfully fopen loads it into memory and sets up a pointer which points to the first character in it.

Returns NULL, if unable to open the file. If the file is opened successfully fopen loads it into memory and sets up a pointer which points to the last character in it. For performing the operations on the file, a special pointer called File pointer is used which is declared as. Skip to content. Change Language. Related Articles. Table of Contents. Improve Article. Save Article. Code with C.

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