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strings as input, substr and len

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strings as input, substr and len

 
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  #1
Mar 30th, 2005
i'm currently writing a program that needs one small piece in my opinion in order to work. i have an array which reads in a bunch of numbers (call them addresses, an example is "003124") and counts the amount of addresses at the moment. i need this to be passed into a switch statement that does certain things for each number in each address, i've written a mix of code/pseudocode
C++ Syntax (Toggle Plain Text) 
  1. entil EOF do;
  2.         string = input;
  3.         len = length(string);
  4.           for i=1 to len do
  5.               ch = substr(string, i-1, 1)
  6.                 switch(ch)
  7.                  //case statements
i want each "string" in the input to be a single address. does anyone know how to do this? i'll provide more information if needed.
thanks in advance.
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Re: strings as input, substr and len

 
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  #2
Mar 30th, 2005
First, I have grown to hate the "while not at end of file" stuff; I now prefer "while successfully obtaining the data I request from the file" approach. Anyways, here is a possible starting point.
C++ Syntax (Toggle Plain Text) 
  1. /* file.txt
  2. 003124
  3. */
  4. #include <iostream>
  5. #include <fstream>
  6. #include <string>
  7.  
  8. int main ()
  9. {
  10.    std::ifstream file("file.txt");
  11.    std::string input;
  12.    while ( std::getline(file, input) )
  13.    {
  14.       for ( std::string::size_type i = 0, len = input.size(); i < len; ++i )
  15.       {
  16.          switch ( input[i] )
  17.          {
  18.          case '0': std::cout << "zero"  << '\n'; break;
  19.          case '1': std::cout << "one"   << '\n'; break;
  20.          case '2': std::cout << "two"   << '\n'; break;
  21.          case '3': std::cout << "three" << '\n'; break;
  22.          default:  std::cout << "other" << '\n'; break;
  23.          }
  24.       }
  25.    }
  26.    return 0;
  27. }
  28.  
  29. /* my output
  30. zero
  31. zero
  32. three
  33. one
  34. two
  35. other
  36. */
"One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand
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Re: strings as input, substr and len

 
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  #3
Mar 30th, 2005
>I have grown to hate the "while not at end of file" stuff
Me too. Mostly because in C and C++ it's a subtle and dangerous error.
I'm here to prove you wrong.
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Re: strings as input, substr and len

 
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  #4
Mar 31st, 2005
ok well since i've counted all the addresses in a previous function call it EOF or "while count < Number of addresses". thats not the part thats bothering me. the purpose of the switch statements is to set up a couple of variables, say xCount YCount and zCount and the case statements will increment 1,2 or all 3 of these depending on the number found. then be able to store these in an array. like so
C++ Syntax (Toggle Plain Text) 
  1. 		switch(addresses[i])
  2. 		{  
  3. 		default: //  don't do anything
  4. 		break;
  5.  
  6. 		case '0':
  7. 				break;
  8.  
  9. 		case '1': xCount++;
  10. 				break;
  11.  
  12. 		case '2': yCount++;
  13. 				break;
  14.  
  15. 		case '3': xCount++;
  16. 				  yCount++;
  17. 				break;
  18.  
  19. 		case '4': zCount++;
  20. 				break;
  21.  
  22. 		case '5': xCount++;
  23. 				  zCount++;
  24. 				break;
  25.  
  26. 		case '6': yCount++;
  27. 				  zCount++;
  28. 				break;
  29.  
  30. 		case '7': xCount++;
  31. 				  yCount++;
  32. 				  zCount++;
  33. 				break;
  34. 		}
  35. 		xCount = g_pVertices[index].x;
  36. 		yCount = g_pVertices[index].y;
  37. 		zCount = g_pVertices[index].z;
  38. 		index++;
  39. 	}
  40. }
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Re: strings as input, substr and len

 
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  #5
Mar 31st, 2005
would something like this work?
C++ Syntax (Toggle Plain Text) 
  1. 	const int MAX_ADDRESSES = g_NumberOfAdds;
  2. 	StrType word;
  3. 	ifstream fp;
  4. 	StrType words[MAX_ADDRESSES];
  5. 	int numAdds = 0;
  6.  
  7. 	word.MakeEmpty();
  8. 	word.GetStringFile(true, ALPHA_NUM, fp);
  9. 	while(fp && numAdds < MAX_ADDRESSES)
  10. 	{
  11.              word.CopyString(words[numAdds]);
  12.              numAdds++;
  13.              word.GetStringFile(true, ALPHA_NUM, fp);
  14.              }
where fp is my file pointer and g_Number Of Adds is my address count from the file
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Re: strings as input, substr and len

 
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  #6
Apr 1st, 2005
can anyone help please? ive got most of the other stuff working its just this thats the bridge in my program that i cant seem to suss out. can anyone shed some light on this for me please?
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Re: strings as input, substr and len

 
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  #7
Dec 8th, 2008
I dont think you explained right. Maybe take more time to explain it
Did you solve this already?
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Re: strings as input, substr and len

 
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  #8
Dec 8th, 2008
> 1st Apr 2005
> 2 Hours Ago
Thick end of 4 years - what do you think?
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Re: strings as input, substr and len

 
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  #9
Dec 10th, 2008
Jaja You right didnt pay attention.
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