Hi, I am writing code in cpp.I have dataset consisting of 80 items.20 items have 20 features each.The value of each feature is stored in csv file.60 items have 26 features and their value is also stored in same csv file.Now 20 items have 20 features corresponding them,and 60 items have 26 features.What should be the default value of 6 features of 20 items who have 20 features.