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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6. 	// (1) define items:
  7. 	//     1. Coke ($35)
  8. 	//     2. Milk tea ($50)
  9. 	//     3. Black tea ($25)
  10. 	// (2) User input: 
  11. 	//     1. make a choice: 1 ~ 3
  12. 	//     2. insert coins
  13. 	// (3) Conversion:
  14. 	//     1. choice -> price
  15. 	//     2. check if the inserted coins are enough
  16. 	//     3. if so, give him/her the bottle and return changes.
  17. 	//     4. otherwise (else), display "Not enough"
  18.  
  19. 	int choice, coins, price;
  20. 	cin >> choice >> coins;
  21.  
  22. 	switch (choice) {
  23. 		case 1:
  24. 			price = 35;
  25. 			break;
  26. 		case 2:
  27. 			price = 50;
  28. 			break;
  29. 		case 3:
  30. 			price = 25;
  31. 			break;
  32. 		default:
  33. 			cout << "沒有這個選項。" << endl;
  34. 			return -1; // abnormal exit
  35. 	}
  36.  
  37. 	int changes = coins - price;
  38. 	if (changes >= 0) {
  39. 		cout << "取回飲料並找零 " << changes << " 元。" << endl;
  40. 	} else {
  41. 		cout << "金額不足，請重新來過。" << endl;	
  42. 	}
  43.  
  44. 	return 0;
  45. }
Success #stdin #stdout 0.01s 5292KB
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取回飲料並找零 30 元。
https://ideone.com/cwojqJ
language:
C++14 (gcc 8.3)
created:
322 days ago
visibility:
secret

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