count_lines_and_numbers_and_print_first_and_last_number, C (clang)

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//clang 3.8.0

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

int main(void)
{
	int n = 12;
	int d = 2;
    FILE* file;
    int i, count = 0;
	size_t lines_count = 0;
	char *delimiter_between_strings = "\n"; //delimiter as string
	char c = delimiter_between_strings[0]; //"n" as '\n' - this is char and int of charcode...
    uint64_t current_int;
	uint64_t first_int;
	uint64_t last_int;
	char filename[256] = "keys.txt";
	file = fopen(filename, "r");

if (!file) {
        printf("Problem with opening file for reading\n");
        return 0; // or some error code
    }
	
    while(!feof(file) && !ferror(file)){
	    if(fscanf(file, "%" PRIu64, &current_int) == 1){count++;}
		if (fgetc(file)==c){lines_count++;}//and here
		if(count==1){first_int=current_int;}
	}

fclose(file);

printf("%d numers and %d lines in the file\n", count, lines_count);
	if(lines_count%d == 0 && count == n){
		if(count==n){last_int=current_int;}
		printf(
			"File seems like a full...\n"
			"first_int = %" PRIu64 ", last_int = %" PRIu64 "\n", first_int, last_int
		);
	}

system("pause");
    return 0;
}

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Compilation time: 0.26 sec, absolute running time: 0.12 sec, cpu time: 0.05 sec, memory peak: 3 Mb, absolute service time: 0,44 sec