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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. struct DonThuc {
  6.     int he_so;
  7.     int he_so_mu;
  8. };
  9.  
  10. class Bai3 {
  11. private:
  12.     DonThuc *arr;
  13.     int sl;
  14.  
  15. public:
  16.     Bai3(int s = 0) {
  17.         sl = s;
  18.         arr = (sl > 0) ? new DonThuc[sl] : nullptr;
  19.     }
  20.     ~Bai3() {
  21.         delete[] arr;
  22.         arr = nullptr;
  23.         sl = 0;
  24.     }
  25.     void Nhap() {
  26.         cin >> sl;
  27.         delete[] arr;
  28.         arr = new DonThuc[sl];
  29.         for (int i = 0; i < sl; i++) {
  30.             cin >> arr[i].he_so >> arr[i].he_so_mu;
  31.         }
  32.     }
  33.     void Xuat() {
  34.         bool co_so_hang = false;
  35.         for (int i = 0; i < sl; i++) {
  36.             if (arr[i].he_so == 0) continue;
  37.             if (co_so_hang) {
  38.                 if (arr[i].he_so > 0) cout << " + ";
  39.                 else cout << " - ";
  40.             } else {
  41.                 if (arr[i].he_so < 0) cout << "-";
  42.             }
  43.             int h = abs(arr[i].he_so);
  44.             int m = arr[i].he_so_mu;
  45.             if (m == 0) {
  46.                 cout << h;
  47.             } else {
  48.                 if (h != 1) cout << h;
  49.                 cout << "x";
  50.                 if (m != 1) {
  51.                     if (m >= 0) cout << "^" << m;
  52.                     else cout << "^(" << m << ")";
  53.                 }
  54.             }
  55.             co_so_hang = true;
  56.         }
  57.         if (!co_so_hang) cout << "0";
  58.         cout << "\n";
  59.     }
  60.     void TinhGiaTri(double x) {
  61.         double tong = 0;
  62.         for (int i = 0; i < sl; i++) {
  63.             tong += arr[i].he_so * pow(x, arr[i].he_so_mu);
  64.         }
  65.         cout << "Gia tri cua da thuc tai " << x << " la: " << tong << "\n";
  66.     }
  67.     void DaoHamCap1() {
  68.         bool co_so_hang = false;
  69.         for (int i = 0; i < sl; i++) {
  70.             if (arr[i].he_so_mu == 0 || arr[i].he_so == 0) continue;
  71.             int moi_hs = arr[i].he_so * arr[i].he_so_mu;
  72.             int moi_mu = arr[i].he_so_mu - 1;
  73.             if (co_so_hang) {
  74.                 if (moi_hs > 0) cout << " + ";
  75.                 else cout << " - ";
  76.             } else {
  77.                 if (moi_hs < 0) cout << "-";
  78.             }
  79.             int h = abs(moi_hs);
  80.             if (moi_mu == 0) {
  81.                 cout << h;
  82.             } else {
  83.                 if (h != 1) cout << h;
  84.                 cout << "x";
  85.                 if (moi_mu != 1) {
  86.                     if (moi_mu >= 0) cout << "^" << moi_mu;
  87.                     else cout << "^(" << moi_mu << ")";
  88.                 }
  89.             }
  90.             co_so_hang = true;
  91.         }
  92.         if (!co_so_hang) cout << "0";
  93.         cout << "\n";
  94.     }
  95. };
  96.  
  97. int main() {
  98.     Bai3 a;
  99.     a.Nhap();
  100.     a.Xuat();
  101.     double x;
  102.     cin >> x;
  103.     a.TinhGiaTri(x);
  104.     a.DaoHamCap1();
  105.     return 0;
  106. }
  107.  
Success #stdin #stdout 0s 5320KB
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Gia tri cua da thuc tai 9.88131e-324 la: 0
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https://ideone.com/cmwHW8
Lời giải Bài 3
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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