Write two functions, which read/write an array of records to/from a file. Write driver code to test the two functions. The driver code and the test output must show clearly that the file input and output work correctly

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;  

}  

explanation:

d. long term memory