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+/*
+Challenge 008
+
+Challenge #2
+Write a function, ‘center’, whose argument is a list of strings, which will
+be lines of text. The function should insert spaces at the beginning of the
+lines of text so that if they were printed, the text would be centered, and
+return the modified lines.
+*/
+
+#include <iostream>
+#include <vector>
+#include <string>
+using namespace std;
+
+void center(vector<string>& lines) {
+ size_t max_len = 0;
+
+ for (auto& line : lines)
+ if (line.size() > max_len)
+ max_len = line.size();
+
+ for (auto& line : lines)
+ line = string((max_len - static_cast<int>(line.size())) / 2, ' ') + line;
+}
+
+int main(int argc, char* argv[]) {
+ argc--; argv++;
+
+ vector<string> lines;
+ for (int i = 0; i < argc; i++)
+ lines.push_back(argv[i]);
+
+ center(lines);
+
+ for (auto& line : lines)
+ cout << line << endl;
+}