Here, fptr is a file pointer associated with the file to be closed.įor reading and writing to a text file, we use the functions fprintf() and fscanf(). The file (both text and binary) should be closed after reading/writing.Ĭlosing a file is performed using the fclose() function. Open for both reading and appending in binary mode. Open for both reading and writing in binary mode. If the file does not exist, it will be created. If the file exists, its contents are overwritten. If the file does not exist, fopen() returns NULL. The reading mode only allows you to read the file, you cannot write into the file. The second function opens the existing file for reading in binary mode 'rb'. Now let's suppose the second binary file oldprogram.bin exists in the location E:\cprogram.The writing mode allows you to create and edit (overwrite) the contents of the file. The first function creates a new file named newprogram.txt and opens it for writing as per the mode 'w'. Let's suppose the file newprogram.txt doesn't exist in the location E:\cprogram. The syntax for opening a file in standard I/O is: ptr = fopen("fileopen","mode") įopen("E:\\cprogram\\oldprogram.bin","rb") Opening a file is performed using the fopen() function defined in the stdio.h header file. This declaration is needed for communication between the file and the program. When working with files, you need to declare a pointer of type file.
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