If the file does not exist, it will be created. “ab” – Open for append in binary mode.If the file doesn’t exist, a new file is 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. If the file exists, its contents are overwritten. “wb” – Open for writing in binary mode.If the file does not exist, fopen( ) returns NULL. “rb” – Open for reading in binary mode.If the file cannot be opened fopen( ) returns NULL. If the file is opened successfully fopen( ) loads it into memory and sets up a pointer which points to the first character in it. Some of the commonly used file access modes are mentioned below. The text in the brackets denotes the functions used for performing those operations.įor opening a file, fopen function is used with the required access modes. Moving to a specific location in a file ( fseek, rewind).Creation of a new file ( fopen with attributes as “a” or “a+” or “w” or “w+”).Core Dump (Segmentation fault) in C/C++.Dynamic Memory Allocation in C using malloc(), calloc(), free() and realloc().What is the difference between printf, sprintf and fprintf?.puts() vs printf() for printing a string.Taking String input with space in C (4 Different Methods).fopen() for an existing file in write mode.Memory leak in C++ and How to avoid it?.C program to find and replace a word in a File by another given word.C program to Replace a word in a text by another given word.Replace all occurrences of string AB with C without using extra space.Find all occurrences of a given word in a matrix. ![]()
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