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  1. #include <iostream> 
  2. using namespace std; 
  3. struct stack { 		
  4. 	long long s[100]; 
  5. 	int cursor=0;  
  6. 	void push(long long n){  
  7. 		s[cursor++]=n; 
  8. 	} 
  9. 	long long pop(){ 
  10. 		return s[--cursor]; 
  11. 	} 
  12. 	long long back(){ 
  13. 		return s[cursor-1]; 
  14. 	} 
  15. 	unsigned size(){ 
  16. 		return cursor; 
  17. 	} 
  18. 	void clear(){ 
  19. 		cursor=0; 
  20. 		s[cursor]=0; 
  21. 	} 
  22. }; 
  23. int main() { 
  24. 	stack x; 
  25. 	string b;    
  26. 	long long n; 
  27. 	while(cin>>b){   
  28. 		if(b=="push"){    
  29. 			cin>>n; 
  30. 			x.push(n); 
  31. 			cout<<"ok"<<endl; 
  32. 		} 
  33. 		else if(b=="pop"){ 
  34. 			if(x.size()==0){
  35. 				cout<<"error"<<endl;
  36. 			}
  37. 			else
  38. 				cout<<x.pop()<<endl; 
  39. 		} 
  40. 		else if(b=="back"){ 
  41. 				if(x.size()==0){
  42. 				cout<<"error"<<endl;
  43. 			}
  44. 			else cout<<x.back()<<endl;  
  45. 		} 
  46. 		else if(b=="size"){ 
  47. 		cout<<x.size()<<endl; 
  48. 		} 
  49. 		else if(b=="clear"){ 
  50. 			x.clear(); 
  51. 			cout<<"ok"<<endl; 
  52. 		} 
  53. 		else if(b=="exit"){ 
  54. 			cout<<"bye"<<endl; 
  55. 			break; 
  56. 		} 
  57. 	} 
  58. 	return 0; 
  59. }
Success #stdin #stdout 0s 3468KB
comments (?)
stdin
copy 
size
push 1
size
back
pop
exit
stdout
copy 
0
ok
1
1
1
bye
https://ideone.com/do04dI
стек
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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