#include <stdio.h>

int main(int argc, char *argv[]) {
    if(argc < 2){
        fprintf(stderr, "Usage %s filename\n", argv[0]);
        return 1;
    }

    FILE *input_stream = fopen(argv[1], "r");
    
    fseek(input_stream, 0, SEEK_END);
    long file_size = ftell(input_stream);
    printf("File size is %ld\n", file_size);
    long middle_pos = file_size/2;

    fseek(input_stream, middle_pos, SEEK_SET);
    int byte = fgetc(input_stream);
    if (byte != EOF) {
        printf("Pos %ld value %x\n", middle_pos, byte);
    }
    fclose(input_stream);
    return 0;
}