(No min/max length required) What are basic program-design principles to keep in mind?

(No min/max length required) What are basic program-design principles to keep in mind? (For Example--When creating programs you will always need to remember that each program is made up of three components INPUT, PROCESSING, OUTPUT

Basic program design principleName of the student:Roll number:University: 1 Basic program design principle:1. The input should be inserted in correct format, such as scanf in c and cin in c++...