Answer :
Answer:
fwrite
// C program for writing
// struct to file
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// a struct to read and write
struct person
{
int id;
char fname[20];
char lname[20];
};
int main ()
{
FILE *outfile;
// open file for writing
outfile = fopen ("person.dat", "w");
if (outfile == NULL)
{
fprintf(stderr, "\nError opend file\n");
exit (1);
}
struct person input1 = {1, "rohan", "sharma"};
struct person input2 = {2, "mahendra", "dhoni"};
// write struct to file
fwrite (&input1, sizeof(struct person), 1, outfile);
fwrite (&input2, sizeof(struct person), 1, outfile);
if(fwrite != 0)
printf("contents to file written successfully !\n");
else
printf("error writing file !\n");
// close file
fclose (outfile);
return 0;
}
fread
// C program for reading
// struct from a file
#include <stdio.h>
#include <stdlib.h>
// struct person with 3 fields
struct person
{
int id;
char fname[20];
char lname[20];
};
// Driver program
int main ()
{
FILE *infile;
struct person input;
// Open person.dat for reading
infile = fopen ("person.dat", "r");
if (infile == NULL)
{
fprintf(stderr, "\nError opening file\n");
exit (1);
}
// read file contents till end of file
while(fread(&input, sizeof(struct person), 1, infile))
printf ("id = %d name = %s %s\n", input.id,
input.fname, input.lname);
// close file
fclose (infile);
return 0;
}