c Получите размер файла
FILE *fp = fopen("example.txt", "r");
fseek(fp, 0L, SEEK_END);
int size = ftell(fp);
Clever Cowfish
FILE *fp = fopen("example.txt", "r");
fseek(fp, 0L, SEEK_END);
int size = ftell(fp);FILE *fp = fopen("file.txt", "w+");
fseek(fp,0,SEEK_END);
int size = ftell(fp) + 1; // we have to account for the 0th position in the file