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feof() function in C language with Example

Here, we are going to learn about the feof() function of library header stdio.h in C language with its syntax, example.
Submitted by Souvik Saha, on January 06, 2019

feof() function in C

Prototype:

    int feof(FILE* filename);

Parameters:

    FILE *filename

Return type: int(0 or 1)

Use of function:

In C language when we are using a stream that links with a file, then how can we determine we come to the end of a file. To solve the problem we have to compare an integer value to the EOF value. Through the feof() function we determine whether EOF of a file has occurred or not. The prototype of this function is int feof(FILE* filename);

It returns the value zero when end of the file has not occurred, otherwise it returns 1.

feof() example in C

#include<stdio.h>
#include<stdlib.h>

int main()
{
	FILE *f;
	char str[100];
	
	//Check the existence of that file
	if((f=fopen("includehelp.txt","r"))==NULL){
		printf("Cannot open the file...");
		//if not exist program is terminated
		exit(1);
	}
	
	printf("File content is--\n");
	//print the strings until EOF is encountered
	while(!feof(f)){
		fgets(str,100,f);
		//print the string
		printf("%s",str);
	}
	
	//close the opened file
	fclose(f);
	
	return 0;
}

Output

feof example in c




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