int main()
{
double a, b, c, deltax, Xp, Xk;
do {
cout << ("Wprowadz a: "); cin >> a;
cout << ("Wprowadz delta(x): "); cin >> deltax;
} while (a <= 0 || deltax <= 0);
cout << ("Wprowadz b: "); cin >> b;
cout << ("Wprowadz c: "); cin >> c;
do {
cout << ("Wprowadz x(p): "); cin >> Xp;
cout << ("Wprowadz x(k): "); cin >> Xk;
} while (Xk <= Xp);
// Xp + (static_cast<double>(rand()) / RAND_MAX)*(Xk - Xp)
}
#endif //(p4)
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