Unreal Engine C++ Codings ref: http://qiita.com/we-yu/items/f25f5a6842d272ba6882

*.cpp

    UPROPERTY(EditAnywhere)
    int32 inputVal1;
    UPROPERTY(EditAnywhere, Category = "User Input")
    int32 inputVal2;

*.h

public: 

    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Damage")
    int32 TotalDamage;

    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Damage")
    float DamageTimeInSeconds;

    UPROPERTY(BlueprintReadOnly, VisibleAnywhere, Transient, Category = "Damage")
    float DamagePerSecond;

    UFUNCTION(BlueprintCallable, Category = "Damage")
    void CalculateValues();

    AEditableSpotLightCpp();

file0.txt

#include "Engine.h"

if (GEngine)
{
    const int32 AlwaysAddKey = -1;
    // Viewport上にメッセージを表示する
    // キー, 表示時間, 文字色, 表示文字
    GEngine->AddOnScreenDebugMessage(AlwaysAddKey, 5.0f, FColor::Yellow, "MESSAGE");
}