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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <ctype.h>
  4.  
  5. #define MAX 100
  6.  
  7. typedef struct {
  8.     char simbol[3];
  9.     int jumlah;
  10. } Unsur;
  11.  
  12. int ambilAngka(char *s, int *i) {
  13.     int angka = 0;
  14.     while (isdigit(s[*i])) {
  15.         angka = angka * 10 + (s[*i] - '0');
  16.         (*i)++;
  17.     }
  18.     if (angka == 0) angka = 1;
  19.     return angka;
  20. }
  21.  
  22. int main() {
  23.     char rumus[MAX];
  24.     Unsur daftar[50];
  25.     int count = 0;
  26.  
  27.     printf("Masukkan rumus kimia: ");
  28.     scanf("%s", rumus);
  29.  
  30.     int len = strlen(rumus);
  31.  
  32.     for (int i = 0; i < len;) {
  33.         if (isupper(rumus[i])) {
  34.             char simbol[3] = "";
  35.             simbol[0] = rumus[i];
  36.             int j = i + 1;
  37.             if (j < len && islower(rumus[j])) {
  38.                 simbol[1] = rumus[j];
  39.                 j++;
  40.             }
  41.  
  42.             int angka = ambilAngka(rumus, &j);
  43.  
  44.             // Cek apakah unsur sudah ada
  45.             int ditemukan = 0;
  46.             for (int k = 0; k < count; k++) {
  47.                 if (strcmp(daftar[k].simbol, simbol) == 0) {
  48.                     daftar[k].jumlah += angka;
  49.                     ditemukan = 1;
  50.                     break;
  51.                 }
  52.             }
  53.  
  54.             // Jika belum ada, tambahkan
  55.             if (!ditemukan) {
  56.                 strcpy(daftar[count].simbol, simbol);
  57.                 daftar[count].jumlah = angka;
  58.                 count++;
  59.             }
  60.  
  61.             i = j;
  62.         } else {
  63.             i++;
  64.         }
  65.     }
  66.  
  67.     // Cetak hasil
  68.     for (int i = 0; i < count; i++) {
  69.         printf("%s %d\n", daftar[i].simbol, daftar[i].jumlah);
  70.     }
  71.  
  72.     return 0;
  73. }
  74.  
Success #stdin #stdout 0.01s 5252KB
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Masukkan rumus kimia:
https://ideone.com/l7MpEl
language:
C (gcc 8.3)
created:
5 days ago
visibility:
public

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