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  1. #include <iostream>
  2. #include <cstdio>
  3. #include <string>
  4. using namespace std;
  5.  
  6. int main()
  7. {
  8. 	char ss[100];
  9. 	int t;
  10. 	int j =0;
  11. 	while (scanf("%s", ss)!=EOF)
  12. 	{
  13. 		string ns="";
  14. 		string s=ss;
  15. 		if (s[0]=='_' || s[s.length()-1]=='_' || (s[0]>='A' && s[0]<='Z'))
  16. 		{
  17. 			cout << "Error!" << endl;
  18. 		}
  19. 		else
  20. 		{
  21. 			for (int i = 1; i < s.length(); i++)
  22. 			{
  23. 				if (s[i]=='_')
  24. 				{
  25. 					t=1;
  26. 					break;
  27. 				}
  28. 				else if(s[i]<='Z' && s[i]>='A')
  29. 				{
  30. 					t=2;
  31. 					break;
  32. 				}
  33. 			}
  34. 			switch (t)
  35. 			{
  36. 				case 1:
  37. 					for (int i = 0; i < s.length(); i++)
  38. 					{
  39. 						if(s[i]>='A' && s[i]<='Z')
  40. 						{
  41. 							cout << "Error!" << endl;
  42. 							break;
  43. 						}
  44. 						else if (s[i]=='_' && s[i+1]=='_')
  45. 						{
  46. 							cout << "Error!" << endl;
  47. 							break;
  48. 						}
  49. 						else if (s[i-1]=='_')
  50. 						{
  51. 							j++;
  52. 							continue;
  53. 						}
  54. 						else if (s[i]=='_')
  55. 						{
  56. 							char a=s[i+1]-32;
  57. 							ns=ns+(a);
  58. 						}
  59. 						else
  60. 						{
  61. 							ns=ns+s[i];
  62. 						}
  63. 						j++;
  64. 					}
  65. 					if (j==s.length())
  66. 					{
  67. 						cout << ns << endl;
  68. 					}
  69. 					break;
  70. 				default:
  71. 					for (int i = 0; i < s.length(); i++)
  72. 					{
  73. 						if (s[i]=='_')
  74. 						{
  75. 							cout << "Error!" << endl;
  76. 						}
  77. 						else if (s[i]>='A' && s[i]<='Z')
  78. 						{
  79. 							char a=s[i]+32;
  80. 							ns=ns+"_"+(a);
  81. 						}
  82. 						else
  83. 						{
  84. 							ns=ns+s[i];
  85. 						}
  86. 						j++;
  87. 					}
  88. 					if (j==s.length())
  89. 					{
  90. 						cout << ns << endl;
  91. 					}
  92. 			}
  93. 		}
  94. 		s="";
  95. 		ns="";
  96. 		j=0;
  97. 	}
  98. 	return 0;
  99. }
Success #stdin #stdout 0s 3476KB
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https://ideone.com/9yK50H
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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