C Program to Read Records From Binary File

C Program to Display Records From Binary File

“Read Records From Binary File” in C Programming is the program we will write today. We have already written a C program to Write Records in a Binary File. We have learned some basic standard library function used in C File programming.

• fopen() to open a file.
• fclose() to close a file
• fread() to read records one by one from a binary file. etc.

Syntax and use of fread() library function for files

Similarly, a standard library function in C programming language is known as fread() function. fread() has parameters similar to fwrite function. For example

fread ( &srecord, sizeof(srecord), 1, fp);

fread() function reads one record at a time, so we will put this function in a while loop. This while loop will continue to read one record at a time as long as fread() function is able to read a record. Therefore, This file reading while loop will break when end of file will be reached.

How many Records to Read and Display?

Since we have entered only two records in C File Program to write records in binary file. Therefore, these two records will be displayed on screen.

C Program to Read Records From Binary File

We may view the output screen of C program to write records in binary file. This confirms that we have inserted only two records in student binary file. We added these records when we executed a File Program to write records in a binary file. We used fwrite() function to write records in a binary file.

output screen of C program to write records in binary file.

Source code of c program to read and show all records from a binary file.

/* Write a C program to read a binary file
and show all records on screen
*/
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>

struct student
{
int rollno;
char name[30];
}srecord;


int main()
{
FILE *fptr;

char ans;
int i;

/*open binary file in read mode*/
fptr=fopen("d://sfile.dat","rb");	
if(fptr==NULL)
{
printf("File could not open");
exit(0);
}

printf("\nRecords in Student File are:");
printf("\n=======================");
i=1;
while((fread(&srecord,sizeof(srecord),1,fptr)==1))
{
	
	printf("\nRecord No:%d",i);
	printf("\n------------------");
	printf("\nRoll No:%d",srecord.rollno);
	printf("\nName:%s",srecord.name);
	i++;
	printf("\n=======================");
}
fclose(fptr);

}