start lab 2

lab_2/8_wildptr-fixed.cpp

@@ -0,0 +1,41 @@
+#include <cassert>
+#include <cstring>
+#include <iostream>
+
+void crop(int num_strings, char** strings, int characters_cropped);
+
+int main(int argc, char** argv)
+{
+   /* crop the first two letters of each input argument,
+    * by jumping from index 0 to index 2
+    */
+   int jump_to_index = 2;  
+    
+   /* crop all of the strings in argv, except the one with index 0;
+    * note that argv[0] is always the program's name.
+    * only the argv[i] with i > 0 are genuine command-line arguments.
+    */
+   crop(argc-1, argv+1, jump_to_index);
+    
+   for(int i = 1; i < argc; i++)
+       std::cout << "Argument no. " << i
+                 << " was cropped to \"" << argv[i] << "\".\n";
+}
+
+/* implementation that "crops" a string by incrementing it, so that
+ * it effectively begins <characters_cropped> characters further ahead.
+ */
+void crop(int num_strings, char** strings, int characters_cropped)
+{
+   assert(characters_cropped >= 0);
+
+   for(int i = 0; i < num_strings; i++)
+      if(strlen(strings[i]) >= characters_cropped)
+         strings[i] += characters_cropped;
+      else strings[i] += strlen(strings[i]);
+}
+
+/* make and try executing:
+ *    ./wildptr-fixed ABCDE FGHIJ KLMNO
+ *    ./wildptr-fixed ABCDE FGHI JKL MN O
+ */