Web Reference: Jan 8, 2025 · In C, fwrite () is a built-in function used to write a block of data from the program into a file. It can write arrays, structs, or other data to files but is especially designed to write binary data in binary files. This function accepts the following parameters − 1. const void *ptr:Pointer to the array of elements to be written. 2. size_t size:Size in bytes of each element to be written. 3. size_t nmemb:Number of elements, each one with a size of size bytes. 4. FILE *stream:Pointer to the FILE object that identifies the stream where data will be written. Definition and Usage The fwrite() function writes data from a block of memory into a file. The fwrite() function is defined in the header file.
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