Reading and writing one line at a time

/* 2103.c: Reading and writing one line at a time */
#include <stdio.h>

enum {SUCCESS, FAIL, MAX_LEN = 81};

void LineReadWrite(FILE *fin, FILE *fout);

main(void)
{
    FILE *fptr1, *fptr2;
    char filename1[]= "test1.txt";
    char filename2[]= "test2.txt";
    int reval = SUCCESS;

    if ((fptr1 = fopen(filename1, "w")) == NULL){
        printf("Cannot open %s for writing.\n", filename1);
        reval = FAIL;
    }
    else if ((fptr2 = fopen(filename2, "r")) == NULL){
        printf("Cannot open %s for reading.\n", filename2);
        reval = FAIL;
    }
    else {
        LineReadWrite(fptr2, fptr1);
        fclose(fptr1);
        fclose(fptr2);
    }

    return reval;
}
/* function definition */
void LineReadWrite(FILE *fin, FILE *fout)
{
    char buff[MAX_LEN];

    while (fgets(buff, MAX_LEN, fin) != NULL){
        fputs(buff, fout);
        printf("%s", buff);
    }
}