update run.sh

run.sh

@@ -7,8 +7,10 @@ output="$3"
 classPath="chocopy-ref.jar:target/assignment.jar"
 
 if [[ "$task" = codegen ]]; then
+    [[ "$output" = "" ]] && output=out.s
     java -cp "$classPath" chocopy.ChocoPy --pass=rrs --out "$output" "$input"
 elif [[ "$task" = codegen-ref ]]; then
+    [[ "$output" = "" ]] && output=out.s
     java -cp "$classPath" chocopy.ChocoPy --pass=rrr --out "$output" "$input"
 elif [[ "$task" = ass ]]; then
     java -cp "$classPath" chocopy.ChocoPy --pass=..s --run --dir src/test/data/pa3/sample/ --test | tee /tmp/cs164_ass.log