C++Server Side ProgrammingProgramming

The C/C++ library function size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream) reads data from the given stream into the array pointed to, by ptr. Following is the declaration for fread() function.

size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream)

The Following table contains the fread() parameters and description:

ParametersDescription
ptrThis is the pointer to a block of memory with a minimum size of size*nmemb bytes.
sizeThis is the size in bytes of each element to be read.
nmembThis is the number of elements, each one with a size of size bytes.
streamThis is the pointer to a FILE object that specifies an input stream.

The total number of elements successfully read are returned as a size_t object, which is an integral data type. If this number differs from the nmemb parameter, then either an error had occurred or the End Of File was reached.

## Example Code

#include <stdio.h>
#include <string.h>
int main () {
FILE *fp;
char c[] = "this is tutorialspoint";
char buffer[100];
/* Open file for both reading and writing */
fp = fopen("file.txt", "w+");
/* Write data to the file */
fwrite(c, strlen(c) + 1, 1, fp);
/* Seek to the beginning of the file */
fseek(fp, 0, SEEK_SET);
/* Read and display data */
}
this is tutorialspoint