Unreal Engine Logging

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    UE_LOG(LogTemp, Warning, TEXT("Hi, I will apear in the output window"));

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	FString MyString;
	UE_LOG(LogTemp, Warning, TEXT("The string value is %s"), *FString MyString;);

    int32 MyInteger;
    UE_LOG(LogTemp, Warning, TEXT("The integer value is: %d"), MyInteger);

    float MyFloat;
    UE_LOG(LogTemp, Warning, TEXT("The float value is: %f"), MyFloat);

    FVector MyVector;
    UE_LOG(LogTemp, Warning, TEXT("The vector value is: %s"), *MyVector.ToString());

    UE_LOG(LogTemp, Warning, TEXT("Current values are: vector %s, float %f, and integer %d"), *YourVector.ToString(), YourFloat, YourInteger);

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    /** 
	 * A macro to declare a logging category as a C++ "extern", usually declared in the header and paired with DEFINE_LOG_CATEGORY in the source. 
	 * Accessible by all files that include the header.
	 * @param CategoryName, category to declare
	 * @param DefaultVerbosity, default run time verbosity
	 * @param CompileTimeVerbosity, maximum verbosity to compile into the code
	 **/
    DECLARE_LOG_CATEGORY_EXTERN(CategoryName, DefaultVerbosity, CompileTimeVerbosity);

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    // In .h file
    ...
    DECLARE_LOG_CATEGORY_EXTERN(MyLogCategory, Log, All);
    ...

    // In .cpp file
    ...
    DEFINE_LOG_CATEGORY(MyLogCategory);
    ...

    // Throughout the code
    ...
    UE_LOG(MyLogCategory, Warning, TEXT("Hi, I will apear in the custom category"));

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    if (GEngine)
        GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Red, [Your String Here]);

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	if(GEngine)
	     GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, TEXT("Some yellow text on screen"));

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	if(GEngine)
	     GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, FString::Printf(TEXT("Example text that prints a float: %f"), [My Float Variable]));