C programming language provides access on high level functions as well as low level OS level calls to handle file on your storage devices. This chapter will take you through the important calls for file management. You can use the fopen function to create a new file or to open an existing file. This call will initialize an object of the type FILE , which contains all the information necessary to control the stream. Opens a text file for writing. If it does not exist, then a new file is created.
Here your program will start writing content from the beginning of the file. Opens a text file for writing in appending mode. Here your program will start appending content in the existing file content. Opens a text file for both reading and writing. It first truncates the file to zero length if it exists, otherwise creates a file if it does not exist.
It creates the file if it does not exist. The reading will start from the beginning but writing can only be appended. If we need to see the output again after sometime, then again we have to execute it. These outputs displayed on the screen cannot be printed too. If we need to see the output for the same set of input again or if we need to take a print of the output, it is always better to have the output in some file.
Whenever we want to see the output for which program is already executed once, we can directly open the output file and see it without re-executing the program.
This function is used to write character by character to opened file. Using this function, one can write only one character at a time. This function is similar to puts. It writes one line at a time into the file. The lines can contain any number of words. This function is similar to printf function. It writes the data into the opened file. This is similar to fputs function above.
It was created by the program, and print function writes the data into the file. We cannot see the output on the screen. It can be viewed only when the file is opened. Suppose we have a data file which contains different student details in each rows. Suppose we have to move the cursor within the file by Then in a normal scenario, we will traverse the cursor by using for loop. But it is a tedious work. In C, it provides a function fseek , to move the position of the cursor within the opened file.
It returns zero if the file is closed successfully and if there is any error it returns EOF. When the compiler encounters fclose function, it writes all the pending data into the file in the secondary memory from the buffer memory, it empties the buffer and releases all those buffer memories and closes the file.
Binary files are also same as normal files like text or dat, but the content of the file will be stored in binary format in the memory. Hence they are difficult to read by any users like human being.
These binary files can be read or processed by binary file processor or programs like C. It provides different functions to read and write binary files. This function is used to read the data from the binary file. This is similar to fscanf function used in the normal files. This function is used to write the data into the file.
This is similar to fprintf function used in the normal files. Learn how to write a c Program to read a text file. Writing IO file reading program in C can be done using various techniques but here in this program, we show how to write a c program to read a line from file and display in a proper way. Happy coding. You can copy paste the below C Program to read text from a file Using while fgetc function , in c compiler to check how the source code work. After you compile and run the above c program to read text from a file and display , your C compiler asks you to enter the filename to read the text and display.
After you enter a.
0コメント