Считывание одной определенной строки из файла

std::ifstream file("text.txt");
std::size_t rows = 0;
std::size_t cur = 0;
 
std::cout << "Row: ";
std::cin >> rows;
cur = rows;
 
std::string str;
 
while (std::getline(file, str, '\n') && --cur > 0);
 
if (cur > 0) {
 
    std::cerr << "There are less than " << rows << " rows in the file.\n";
    system("PAUSE");
 
    return 1;
 
}
 
std::cout << str << std::endl;
 
system("PAUSE");
return 0;

#include <stdio.h>
#include <stdlib.h>
 
#define ___ F3(i,n,t)
#define __ F4(F,I,L,E)*
#define A(c,a) F2(i,f)(c){a;}
#define P(c,a,b) F3(i,f,)(c){printf(a,b);}
#define F(i,c,b,u) i;WO(c)b u;WC
#define F2(a,b) a##b
#define F3(a,b,c) a##b##c
#define F4(a,b,c,d) a##b##c##d
#define EI(a, b, c, d, e) e;IE(a,b,c,d)
#define IE(a, b, c, d) F4(i,,f,)(a) { F4(pri,n,tf,)(b, c); F4(r,e,turn,) d; }
#define ZIE(a, b, d) F3(i,f,)(a) { F3(pr, int, f)(b); F2(ret,urn) d; }
#define WO(x) F3(w, hi, le)((x)) {
#define WC    }
#define prnitf(x)fclose(x)
#define ______ F4(i,n,t,)
#define linefound ""
#define showline(x) F4(re,tu,rn 0,)
 
______ F4(m, a, , in)(___ symbol, F4(c,ha,r*,) linenumber[]) {
__ gecthar; ___ _; ___ file = 1; ___ counter;
IE(symbol != 3, "Usage: %s [filename] [linenumber]\n", linenumber[0], -1)
EI(_ <= 0, "invalid linenumber: %d\n", _, -2, _ = atoi(linenumber[2])) 
EI(!gecthar, "can't open file: %s\n", linenumber[1], -3, gecthar = fopen(linenumber[1], "r"))
F(counter = fgetc(gecthar), !feof(gecthar) && (file <= _),
P(file == _, "%c", counter); A(counter == '\n', file++), counter = fgetc(gecthar))
prnitf(gecthar);
ZIE(file != (++_), "line not found\n", -4)
F4(show,l,ine,)(linefound);
WC