During the early days of my career, I used a variety of development environments, including the most popular Turbo C along with FoxPro, PowerBuilder, and Delphi before finally settling down with Microsoft Visual Studio. The first line of code that I have ever written was in QBasic running on Microsoft DOS. The editor had useful features like adding the line numbers and automatically converting the statements to uppercase. Hitting F5 would run the program instantly without having to switch to the command prompt.