code: added error check

main.cpp

@@ -53,9 +53,24 @@ input_data(istream& in, bool prompt) {
     return in1;
 }
 
-int main()
+int main(int argc, char* argv[])
 {
     curl_global_init(CURL_GLOBAL_ALL);
+    if (argc > 1) {
+        CURL* curl = curl_easy_init();
+        if (curl) {
+            CURLcode res;
+            curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
+            res = curl_easy_perform(curl);
+            if (res != 0) {
+                cerr << curl_easy_strerror(res);
+                exit(1);
+            }
+        }
+        curl_easy_cleanup(curl);
+        return(0);
+        
+    }
     const size_t SCREEN_WIDTH = 80;
     const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
     auto in1 = input_data(cin,true);