Computer Science Canada C++ String Handling |
| Author: | jrcdude [ Mon Feb 21, 2011 12:30 am ] |
| Post subject: | C++ String Handling |
For this post I will be referring to the CCC 2010 Junior Problem 4 question. For my implementation of receiving the data to process, I had to use some very hacky techniques. I would like to know what the proper way to do this would be. Example: string input = "7 3 4 6 4 5 7 5"; int out[10]; I did the follow: (int)input.at(0) - 48 //results in number of integers following loop through the string if((int)input.at(x) != 32) out[x] = (int)input.at(x) - 48 if(input.at(x+1) != 32) out[x] *= 10 out[x] += (int)input.at(x + 1) - 48 So as you can see it gets messy with the (int) conversion, etc. I know in Java it would be much better to simply use a tokenizer with a space as a delimiter, but how would one do something such as this easily in C++, or is there a better technique for input such as this. Thanks, Jason |
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| Author: | Tony [ Mon Feb 21, 2011 12:46 am ] |
| Post subject: | RE:C++ String Handling |
Isn't the iostream library the first thing that is taught for C++ (it being necessary for Hello World)? Quote: McAwesome:/tmp $ cat test.cpp #include <iostream> int main(){ int num_inputs, num; std::cin >> num_inputs; for(int i=0; i < num_inputs; i++){ std::cin >> num; std::cout << "lol: " << num << std::endl; } return 0; } McAwesome:/tmp $ g++ test.cpp McAwesome:/tmp $ echo "7 3 4 6 4 5 7 5" | ./a.out lol: 3 lol: 4 lol: 6 lol: 4 lol: 5 lol: 7 lol: 5 |
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| Author: | jrcdude [ Mon Feb 21, 2011 12:57 am ] |
| Post subject: | RE:C++ String Handling |
My god.. Must have missed that lesson that each space counts as a new input. Thanks a lot! |
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