add lab3

lab3/print_grid2D.cpp

@@ -0,0 +1,40 @@
+// Read and print a file with format GRID2D_POINTS3D.
+// Mainly for testing.
+
+#include <iostream>
+#include <string>
+
+#include "grid2DPoints3D.h"
+#include "grid2DIO.h"
+
+
+// ********************* Functions ************************************
+
+void UsageMsg(const std::string& command_name) {
+    std::cerr << "Usage: " << command_name << " {filename}\n";
+}
+
+
+// ********************* Main *****************************************
+
+int main(int argc, char* argv[]) {
+
+    if (argc == 1) {
+        UsageMsg(argv[0]);
+        return 0;
+    }
+
+    GRID2D_POINTS3D grid2D;
+
+    try {
+        OpenReadGrid2DPoints3D(argv[1], grid2D);
+    }
+    catch (const std::exception&) {
+        std::cerr << "Exiting...\n";
+        return -1;
+    }
+
+    grid2D.FormattedPrint();
+
+    return 0;
+}