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copied!<pre><code>#include <fstream> #include <iostream> #include <string> #include <algorithm> std::vector<std::string> split_string(std::string src, std::string delim) { std::vector<std::string> tokens; std::string tmp = src; size_t i = 0; while (i < tmp.length()) { int oi = i; i = tmp.find(delim, i); if(i != std::string::npos) { tokens.push_back(tmp.substr(oi, i - oi)); } else { tokens.push_back(tmp.substr(oi)); break; } i += delim.length(); } return tokens; } int main(int argc, char* argv[]) { std::ifstream file3("file3.csv"); std::string buf3; std::getline(file3, buf3); file3.close(); std::ifstream file2("file2.csv"); std::string buf2; std::getline(file2, buf2); file3.close(); auto vec3 = split_string(buf3, " "); auto vec2 = split_string(buf2, " "); int size = vec3.size(); for (int n = 0; n < size; n++) { std::cout << vec3[n] << " " << vec2[n]; if (n < size - 1) std::cout << " "; } return 0; } </code></pre> <p>Ah, original question was updated... OMG</p> <p>Then, next</p> <pre><code>#include <fstream> #include <iostream> #include <string> #include <algorithm> int main(int argc, char* argv[]) { std::ifstream file1("file1.csv"); std::ifstream file2("file2.csv"); std::ofstream out("final.csv", std::ios::app); std::string buf1; std::string buf2; while(file1 >> buf1) { file2 >> buf2; out << buf1 << " " << buf2 << std::endl; } file1.close(); file2.close(); out.close(); } </code></pre>

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