String to Vector

This is a discussion on String to Vector within the C++ Programming forums, part of the General Programming Boards category; How I can place number from a String value of S1("4545645486465") to a vector Vec.. The trick part is that ...

  1. #1
    Registered User
    Join Date
    Jan 2003
    Posts
    1

    Question String to Vector

    How I can place number from a String value of
    S1("4545645486465") to a vector Vec.. The trick part is that I have to place 4 digits in each cell of the vector. Example:

    string s1("468648578468486846845")
    vector<int>Vec
    void main()
    {
    ...
    ...
    ...
    ...

    }
    Vec[0]=4686
    Vec[1}=4857
    Vec[2]=8468
    ....Vec[n]
    ....
    Please Help me..

  2. #2
    Eibro!@Home
    Guest
    Think about this logically.
    You need to extract 4 characters, get their numerical value, and push them onto a vector.

    Code:
    #include <vector>
    #include <string>
    #include <iostream>
    #include <cstdlib>
    
    std::vector<int> fill_vec(const std::string &input);
    
    int main(int argc, char* argv[])
    {
    	std::string mystr("13345678198734568765");
    	std::vector<int> returned = fill_vec(mystr);
    
    	for (int i = 0; i < returned.size(); i++)
    		std::cout<<returned[i]<<std::endl;
    	return 0;
    }
    
    
    std::vector<int> fill_vec(const std::string &input)
    {
    	typedef std::string::size_type st;
    
    	std::string temp;
    	std::vector<int> intvec;
    
    	for (st index = 0; index < input.size(); index += 4)
    	{
    		for (int i = index; i < index+4; i++)
    			temp += input[i];
    
    		intvec.push_back(atoi(temp.c_str()));
    		temp.erase();
    		
    	}
    	return intvec;
    }
    It's 3AM
    Here's a sloppy, yet functional solution. input must be a multiple of 4.

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