showing errors

main.cpp

@@ -2,6 +2,7 @@
 #include "histogram.h"
 #include "svg.h"
 #include <vector>
+#include <curl/curl.h>
 
 using namespace std;
 
@@ -39,7 +40,17 @@ Input input_data(istream& sin, bool prompt)
     }
 }
 
-int main() {
+int main(int argc, char* argv[]) {
+    if (argc > 1) {
+        CURL* curl = curl_easy_init();
+        auto res = curl_easy_perform(curl);
+        if (res != 0) {
+            cout << curl_easy_strerror(res);
+            exit(1);
+        }
+        curl_easy_cleanup(curl);
+        return 0;
+    }
     Input in = input_data(cin, false);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);