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  1. #include <iostream>
  2. #include <map>
  3. #include <string>
  4. #include <cctype> // Untuk fungsi isupper, islower, isdigit
  5.  
  6. std::map<std::string, int> hitungAtomSederhana(const std::string& rumus) {
  7.     std::map<std::string, int> hitungan;
  8.     int n = rumus.length();
  9.  
  10.     for (int i = 0; i < n; ++i) {
  11.         // 1. Identifikasi Unsur
  12.         if (isupper(rumus[i])) {
  13.             std::string unsur = "";
  14.             unsur += rumus[i];
  15.  
  16.             // Cek jika ada huruf kecil setelah huruf kapital (misal: He, Mg)
  17.             if (i + 1 < n && islower(rumus[i+1])) {
  18.                 unsur += rumus[i+1];
  19.                 i++; // Maju satu karakter lagi
  20.             }
  21.  
  22.             // 2. Identifikasi Angka
  23.             std::string strAngka = "";
  24.             int j = i + 1;
  25.             while (j < n && isdigit(rumus[j])) {
  26.                 strAngka += rumus[j];
  27.                 j++;
  28.             }
  29.  
  30.             int jumlah = (strAngka == "") ? 1 : std::stoi(strAngka);
  31.             hitungan[unsur] += jumlah;
  32.  
  33.             i = j - 1; // Sesuaikan indeks loop utama
  34.         }
  35.     }
  36.     return hitungan;
  37. }
  38.  
  39. int main() {
  40.     std::string rumus1 = "H2O";
  41.     std::string rumus2 = "C6H12O6";
  42.  
  43.     std::cout << "Rumus: " << rumus2 << std::endl;
  44.     std::map<std::string, int> hasil = hitungAtomSederhana(rumus2);
  45.  
  46.     for (const auto& pair : hasil) {
  47.         std::cout << pair.first << ": " << pair.second << std::endl;
  48.     }
  49.  
  50.     return 0;
  51. }
  52.  
Success #stdin #stdout 0s 5308KB
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stdin
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Standard input is empty
stdout
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Rumus: C6H12O6
C: 6
H: 12
O: 6
https://ideone.com/A4Z9ME
language:
C++ (gcc 8.3)
created:
14 days ago
visibility:
public

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