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  1. #include <stdio.h>
  2.  
  3. // กำหนดค่าของแต่ละสถานะ
  4. typedef enum {
  5.     STATE_INITIAL,
  6.     STATE_RUNNING,
  7.     STATE_STOPPED,
  8.     STATE_ERROR
  9. } State;
  10.  
  11. // ฟังก์ชั่นสำหรับเปลี่ยนสถานะของเครื่อง
  12. void transition(State *state, char input) {
  13.     switch (*state) {
  14.         case STATE_INITIAL:
  15.             if (input == 'S') {
  16.                 *state = STATE_RUNNING;
  17.                 printf("Transitioning to RUNNING state.\n");
  18.             } else {
  19.                 *state = STATE_ERROR;
  20.                 printf("Error! Invalid input.\n");
  21.             }
  22.             break;
  23.         case STATE_RUNNING:
  24.             if (input == 'P') {
  25.                 *state = STATE_STOPPED;
  26.                 printf("Transitioning to STOPPED state.\n");
  27.             } else if (input == 'S') {
  28.                 *state = STATE_RUNNING;
  29.                 printf("Already in RUNNING state.\n");
  30.             } else {
  31.                 *state = STATE_ERROR;
  32.                 printf("Error! Invalid input.\n");
  33.             }
  34.             break;
  35.         case STATE_STOPPED:
  36.             if (input == 'S') {
  37.                 *state = STATE_RUNNING;
  38.                 printf("Transitioning to RUNNING state.\n");
  39.             } else if (input == 'P') {
  40.                 *state = STATE_STOPPED;
  41.                 printf("Already in STOPPED state.\n");
  42.             } else {
  43.                 *state = STATE_ERROR;
  44.                 printf("Error! Invalid input.\n");
  45.             }
  46.             break;
  47.         case STATE_ERROR:
  48.             printf("Machine is in ERROR state. Cannot transition further.\n");
  49.             break;
  50.     }
  51. }
  52.  
  53. int main() {
  54.     // เริ่มต้นเครื่องในสถานะ STATE_INITIAL
  55.     State currentState = STATE_INITIAL;
  56.     char input;
  57.  
  58.     printf("Machine is starting...\n");
  59.  
  60.     // ทำงานในลูปจนกว่าจะเกิด error
  61.     while (currentState != STATE_ERROR) {
  62.         printf("Current state: ");
  63.         switch (currentState) {
  64.             case STATE_INITIAL: printf("INITIAL\n"); break;
  65.             case STATE_RUNNING: printf("RUNNING\n"); break;
  66.             case STATE_STOPPED: printf("STOPPED\n"); break;
  67.             default: break;
  68.         }
  69.  
  70.         printf("Enter command (S: Start, P: Stop): ");
  71.         scanf(" %c", &input);  // รับค่าจากผู้ใช้
  72.  
  73.         transition(&currentState, input);  // เปลี่ยนสถานะตามคำสั่งที่รับ
  74.     }
  75.  
  76.     return 0;
  77. }
  78.  
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
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Standard input is empty
stdout
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Machine is starting...
Current state: INITIAL
Enter command (S: Start, P: Stop): Error! Invalid input.
https://ideone.com/blVA85
language:
C (gcc 8.3)
created:
9 days ago
visibility:
public

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