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    <pre><code>#include &lt;fstream&gt; #include &lt;iostream&gt; #include &lt;string&gt; #include &lt;algorithm&gt; std::vector&lt;std::string&gt; split_string(std::string src, std::string delim) { std::vector&lt;std::string&gt; tokens; std::string tmp = src; size_t i = 0; while (i &lt; 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 &lt; size; n++) { std::cout &lt;&lt; vec3[n] &lt;&lt; " " &lt;&lt; vec2[n]; if (n &lt; size - 1) std::cout &lt;&lt; " "; } return 0; } </code></pre> <p>Ah, original question was updated... OMG</p> <p>Then, next</p> <pre><code>#include &lt;fstream&gt; #include &lt;iostream&gt; #include &lt;string&gt; #include &lt;algorithm&gt; 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 &gt;&gt; buf1) { file2 &gt;&gt; buf2; out &lt;&lt; buf1 &lt;&lt; " " &lt;&lt; buf2 &lt;&lt; std::endl; } file1.close(); file2.close(); out.close(); } </code></pre>
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    1. POHow to merge two single column csv files into one multi column csv file using Qt?
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    1. COIf we want to merge two csv files with 2 columns each into one single csv file then what changes should we do in the above code ?
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    2. COWhat do you mean `merge`?
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