add leading ./ in ./a.out

Author: rwgk

caster_odr/compile_and_run.sh

@@ -1,7 +1,7 @@
 set -e
 set -x
-clang++ -std=c++11 car.cc truck.cc vehicle_specs.cc && a.out
-clang++ -std=c++11 truck.cc car.cc vehicle_specs.cc && a.out
-clang++ -std=c++11 -DUSE_TRANSLATION_UNIT_TAG car.cc truck.cc vehicle_specs.cc && a.out
-clang++ -std=c++11 -DUSE_TRANSLATION_UNIT_TAG truck.cc car.cc vehicle_specs.cc && a.out
+clang++ -std=c++11 car.cc truck.cc vehicle_specs.cc && ./a.out
+clang++ -std=c++11 truck.cc car.cc vehicle_specs.cc && ./a.out
+clang++ -std=c++11 -DUSE_TRANSLATION_UNIT_TAG car.cc truck.cc vehicle_specs.cc && ./a.out
+clang++ -std=c++11 -DUSE_TRANSLATION_UNIT_TAG truck.cc car.cc vehicle_specs.cc && ./a.out
 rm a.out