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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <ctype.h>
  4. #include <math.h>
  5.  
  6. int c;
  7.  
  8. // ฟังก์ชันคำนวณน้ำหนักโมเลกุล
  9. double calculate_molecular_weight(const char *formula) {
  10.     double molecular_weight = 0.0;
  11.     int i = 0;
  12.     while (formula[i] != '\0') {
  13.     double weight = 0.0;
  14.  
  15.         // ตรวจสอบธาตุที่มีสัญลักษณ์ 1 ตัว
  16.         if (formula[i] == 'H') weight = 1.008;
  17.         else if (formula[i] == 'B') weight = 10.81;
  18.         else if (formula[i] == 'C') weight = 12.01;
  19.         else if (formula[i] == 'N') weight = 14.01;
  20.         else if (formula[i] == 'O') weight = 16.00;
  21.         else if (formula[i] == 'F') weight = 19.00;
  22.         else if (formula[i] == 'P') weight = 30.97;
  23.         else if (formula[i] == 'S') weight = 32.07;
  24.         else if (formula[i] == 'K') weight = 39.10;
  25.         else if (formula[i] == 'V') weight = 50.94;
  26.  
  27.         // ตรวจสอบธาตุที่มี 2 ตัวอักษร
  28.  
  29.         if (i + 1 < strlen(formula)) {
  30.             // ตรวจสอบธาตุสองตัวที่มีการใช้ตัวอักษรทั้งสองตัว เช่น 'Na', 'Mg', 'Cl'
  31.  
  32.             if (formula[i] == 'H' && formula[i + 1] == 'e') { weight = 4.00; i++; }
  33.             else if (formula[i] == 'L' && formula[i + 1] == 'i') { weight = 6.94; i++; }
  34.             else if (formula[i] == 'B' && formula[i + 1] == 'e') { weight = 9.01; i++; }
  35.             else if (formula[i] == 'N' && formula[i + 1] == 'e') { weight = 20.18; i++; }
  36.             else if (formula[i] == 'N' && formula[i + 1] == 'a') { weight = 23.00; i++; }
  37.             else if (formula[i] == 'M' && formula[i + 1] == 'g') { weight = 24.31; i++; }
  38.             else if (formula[i] == 'A' && formula[i + 1] == 'l') { weight = 26.98; i++; }
  39.             else if (formula[i] == 'S' && formula[i + 1] == 'i') { weight = 28.09; i++; }
  40.             else if (formula[i] == 'C' && formula[i + 1] == 'l') { weight = 35.45; i++; }
  41.             else if (formula[i] == 'A' && formula[i + 1] == 'r') { weight = 39.95; i++; }
  42.             else if (formula[i] == 'C' && formula[i + 1] == 'a') { weight = 40.08; i++; }
  43.             else if (formula[i] == 'S' && formula[i + 1] == 'c') { weight = 44.96; i++; }
  44.             else if (formula[i] == 'T' && formula[i + 1] == 'i') { weight = 47.87; i++; }
  45.             else if (formula[i] == 'C' && formula[i + 1] == 'r') { weight = 52.00; i++; }
  46.             else if (formula[i] == 'M' && formula[i + 1] == 'n') { weight = 54.94; i++; }
  47.             else if (formula[i] == 'F' && formula[i + 1] == 'e') { weight = 55.85; i++; }
  48.             else if (formula[i] == 'C' && formula[i + 1] == 'o') { weight = 58.93; i++; }
  49.             else if (formula[i] == 'N' && formula[i + 1] == 'i') { weight = 58.69; i++; }
  50.             else if (formula[i] == 'C' && formula[i + 1] == 'u') { weight = 63.55; i++; }
  51.             else if (formula[i] == 'Z' && formula[i + 1] == 'n') { weight = 65.39; i++; }
  52.             else continue;  // ถ้าธาตุไม่รู้จักให้ข้ามไป
  53.         }
  54.  
  55.         // ถ้าธาตุไม่รู้จักให้ข้ามไป
  56.         if (weight == 0.0) {
  57.             printf("\t Unknown element detected: %c%c\n", formula[i], formula[i + 1]!= '\0' ? formula[i + 1] : ' ');
  58.             return -1;  // แสดงว่ามีธาตุที่ไม่รู้จัก
  59.         }
  60.  
  61.         // ตรวจสอบจำนวนของอะตอม
  62.         int count = 0;
  63.         while (isdigit(formula[i + 1])) {
  64.             count = count * 10 + (formula[++i] - '0');
  65.         }
  66.         if (count == 0) count = 1;
  67.         molecular_weight += weight * count;
  68.         i++;
  69.     }
  70.  
  71.     return molecular_weight;
  72. }
  73.  
  74. int main() {
  75.     float g, Mw, Mol, N, V;
  76.     char formula[100];
  77.  
  78.     printf("\t Please select choice to Find Mol \n");
  79.     printf("\t *****************\n");
  80.     printf("\t 1.If want to find Mol from g/Mw #\n");
  81.     printf("\t 2.If want to find Mol from N/(6.02*pow(10,23)) #\n");
  82.     printf("\t 3.If want to find Mol from V/22.4 #\n");
  83.     printf("\t Select : ");
  84.     scanf("%d", &c);
  85.  
  86.     switch (c) {
  87.     case 1:
  88.  
  89.         printf("\t Please enter g : ");
  90.         scanf("%f", &g);
  91.  
  92.         printf("\t Please enter chemical formula (e.g., H2O): ");
  93.         scanf("%s", formula);
  94.  
  95.         double Mw = calculate_molecular_weight(formula);
  96.         if (Mw == -1) {
  97.             printf("\t Invalid formula or unknown element.\n");
  98.             break;
  99.         }
  100.  
  101.         printf("\t Molecular weight of %s is %.2f g/mol\n", formula, Mw);
  102.         printf("\t Mol of Substance is %.2f / %.2f = %.2f\n", g, Mw, g / Mw);
  103.         break;
  104.  
  105.     case 2:
  106.         printf("\t Please enter N : ");
  107.         scanf("%f", &N);
  108.         printf("\t Mol of Substance is %.2f / (6.02*pow(10,23)) = %.2f\n", N, N / (6.02 * pow(10, 23)));
  109.         break;
  110.  
  111.     case 3:
  112.         printf("\t Please enter V : ");
  113.         scanf("%f", &V);
  114.         printf("\t Mol of Substance is %.2f / 22.4 = %.2f\n", V, V / 22.4);
  115.         break;
  116.  
  117.     default:
  118.         printf("Please select 1-3 only\n");
  119.         break;
  120.     }
  121.  
  122.     return 0;
  123. }
  124.  
  125.  
  126.  
Success #stdin #stdout 0s 5288KB
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Standard input is empty
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	 Please select choice to Find Mol 
	 *****************
	 1.If want to find Mol from g/Mw #
	 2.If want to find Mol from N/(6.02*pow(10,23)) #
	 3.If want to find Mol from V/22.4 #
	 Select : Please select 1-3 only
https://ideone.com/ZiBcMN
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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