diff --git a/cpp.sh b/cpp.sh
index c5387ab..5f61f0f 100644
--- a/cpp.sh
+++ b/cpp.sh
@@ -10,40 +10,63 @@ fi
 FILE_EXTENSION="$1"
 CODE_FILE="/usr/src/app/cpp-engine/app/main.${FILE_EXTENSION}"
 
+# Check if the code file exists
+if [ ! -f "$CODE_FILE" ]; then
+    echo "Error: Code file not found: $CODE_FILE"
+    exit 1
+fi
+
 
 if [ "$FILE_EXTENSION" == "c" ]; then
     clang -o output_program "$CODE_FILE" 2> compile_error.txt
 elif [ "$FILE_EXTENSION" == "cpp" ]; then
     clang++ -o output_program "$CODE_FILE" 2> compile_error.txt
+else
+    echo "Error: Invalid language specified. Use 'c' or 'cpp'."
+    exit 1
 fi
+
 # Check if there were any compilation errors
 if [ $? -ne 0 ]; then
     echo -e "Compilation failed!\n"
-    cat compile_error.txt
+    if [ -s "compile_error.txt" ]; then
+        cat compile_error.txt
+    else
+        echo "No compilation error message found."
+    fi
     exit 1
 fi
-# Run the compiled program and capture runtime errors
-./output_program > output.txt 2> runtime_error.txt
 
-# Check if there were any runtime errors
-if [ $? -ne 0 ]; then
-    echo -e "Runtime error!\n"
-    cat runtime_error.txt
-    exit 1
-
-fi
 # start
-if [ -f "/usr/src/app/cpp-engine/app/input.txt" ]; then
+INPUT_FILE="/usr/src/app/cpp-engine/app/input.txt"
+if [ -f "$INPUT_FILE" ]; then
     # Run the compiled program with input redirection
-    ./output_program < /usr/src/app/cpp-engine/app/input.txt > output.txt 2> runtime_error.txt
+    ./output_program < "$INPUT_FILE" > output.txt 2> runtime_error.txt
 else
     # Run the compiled program without input redirection
     ./output_program > output.txt 2> runtime_error.txt
 fi
 # end
+
+# Check if there were any runtime errors
 if [ $? -ne 0 ]; then
-    cat runtime_error.txt
+    echo -e "Runtime error!\n"
+    if [ -s "runtime_error.txt" ]; then
+        cat runtime_error.txt
+    else
+        echo "No runtime error message found."
+    fi
+    exit 1
+fi
+
+# Check if output.txt exists before attempting to cat it
+if [ -f "output.txt" ]; then
+    cat output.txt
+else
+    echo "Output file not found."
     exit 1
 fi
 
-cat output.txt
\ No newline at end of file
+# Note: This script assumes sufficient permissions to execute the compiled program
+# and create/write to files in the current directory.  File permission issues
+# are outside the scope of this script and must be handled separately.
\ No newline at end of file