spliting strings

Hey,
I'm working on a program where i need to enter a string of numbers and then seperate the numbers by the at every space.
Example:
input "103 105 235" then i want something like an array with array[0] = 103, array[1] = 105, ect.
any help would be greatly appricated

do you want the numbers as strings or integers?

i.e. array[0] = 103 or array[0] = "103"

I'd look at the stringstream class

First get the amount of spaces, then make an array of that size + 1. Then loop through the inputed string, throwing chars into a temp buffer. Once you hit a space, convert the temp buffer into an int, and put it in the array, and so on and so forth. Btw, this sounds like homework.

Quote:

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Originally Posted by Yarin

First get the amount of spaces, then make an array of that size + 1. Then loop through the inputed string, throwing chars into a temp buffer. Once you hit a space, convert the temp buffer into an int, and put it in the array, and so on and so forth. Btw, this sounds like homework.

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meh, too much like work. use a stringstream.

Code:

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char line[] = "103 56 73 89";
int numbers[99];
int numbCount = 0;
char* word = strtok(line, " ");
while(word != NULL && numbCount < 99)
{
  numbers[numbCount] = atoi(word);
  word = strtok(NULL, " ");
  numbCount++;
}

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better to use stringstream over the strtok, that has some issues

Code:

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std::string input("103 56 73 89");
std::istringstream s(input);
std::vector<int> nums;
int temp;
while(s >> temp) nums.push_back(temp);

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or maybe if you prefer

Code:

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int* nums;
std::string input = "103 56 73 89";
int elements = std::count(input.begin(),input.end(), ' ') + 1;
num = new int[elements];
std::istringstream s(input);
for(int x = 0; x < elements, ++x) s >> nums[x];

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You don't need to use a stringstream if the input is already from a stream like standard input. For example:

Code:

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vector<int> targetArray;
copy( istream_iterator<int>(cin), istream_iterator<int>(), back_inserter(targetArray) );

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One could also eliminate the explicit loop in the former example by using std::copy(), e.g.,

Code:

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std::string input("103 56 73 89");
std::istringstream s(input);
std::vector<int> nums;
std::copy(std::istream_iterator<int>(s), std::istream_iterator<int>(),
          std::back_inserter(nums));

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