C language count the number of lines in the file

/*
Example:get file line count  in C language
*/

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

int main(int argc, char const *argv[]) {

    FILE *fileptr;
    int count_lines = 0;
    char filename[40] = {'t','e','s','t','.','t','x','t'};
    char chr;

    fileptr = fopen(filename, "r");

    chr = getc(fileptr);
    if(chr != EOF && chr != '\n')
        count_lines = 1;
    while (chr != EOF)
    {
        // Check if it is a line break
        if (chr == '\n')
        {
            count_lines = count_lines + 1;
        }
        // Gets the next character
        chr = getc(fileptr);

    }
    fclose(fileptr);
    printf("there are %d lines in the file %s \n",count_lines, filename);
    return 0;
}