diff --git a/ucompile b/ucompile
index 63d4954..42bc239 100755
--- a/ucompile
+++ b/ucompile
@@ -13,7 +13,7 @@ def check_dependencies() -> None:
 
     for command in commands:
         if os.system(f"which {command} > /dev/null") != 0:
-            print(f"{Fore.RED}WARNING: {command} not found{Style.RESET_ALL}")
+            print(f"{Fore.ORANGE}WARNING: {command} not found{Style.RESET_ALL}")
     return
 
 
@@ -100,10 +100,18 @@ def run_input_cases(program, args) -> bool:
                     print("❌")
                     passed = False
                     # green expected output and red program output
-                    print(f"{Fore.GREEN}Expected output:{Style.RESET_ALL}")
-                    print(expected_output)
-                    print(f"{Fore.RED}Program output:{Style.RESET_ALL}")
-                    print(program_output.strip())
+                    # print(f"{Fore.GREEN}Expected output:{Style.RESET_ALL}")
+                    # print(expected_output)
+                    # print(f"{Fore.RED}Program output:{Style.RESET_ALL}")
+                    # print(program_output.strip())
+                    # print a diff  
+                    print(f"{Fore.YELLOW}Diff:{Style.RESET_ALL}")
+                    # temporary file to store program output
+                    with open("temp", "w") as f:
+                        f.write(program_output)
+                    os.system(f"diff -u {out_file} - < temp")
+                    os.remove("temp")
+
             else:
                 print(
                     f"{Fore.YELLOW}Expected output file not found; cannot compare outputs.{Style.RESET_ALL}"
@@ -152,10 +160,15 @@ def haskell_compile(file_name, args):
 
 def c_compile(file_name, args):
     # Style the code in Meijster's way
-    os.system("astyle -A2s2cxgk3W3xbj " + file_name)
-    os.system(
-        "gcc -Wall -pedantic --std=c99 -g -o program -lm -Wno-unused-result " + file_name
-    )
+    # os.system("astyle -A2s2cxgk3W3xbj " + file_name)
+    # If you want
+    
+    # stop if compilation fails
+    if os.system(
+        "gcc -Wall -pedantic --std=c99 -g -o program -pthread -lm -Wno-unused-result " + file_name
+    ):
+        return False
+        
     run_input_cases("./program", args)
     return