How to make mobile apps for different OS

Question

Hi friends i want to know about how to make apps for different OS.For eg: ANDROID,BLACKBERRY,iPhone,Windows Phone and Nokia phone.Which programming language is required for there different OS.Can any same programming language can be use for all this different OS.

Answer 1

1. To make apps (mobile apps, I think you mean) for different OS's(I think you mean the different OS's on each phone),(assumption: that you're coding it from scratch) you learn a programming language first, then proceed to learn how to make apps for a particular OS. Typically, you purchase a book (look online for good recommendations) and start from there. You can also find tons of online resource about coding basics, and mobile app development.
2. I am sure you can use most popular languages; Java, Python, C++/C#/C, etc... Generally, people make either Android Apps, or iOS apps. They code in Java for Android (and it's derivatives), and Objective-C in iOS but Swift is quite new and I heard it has many cool features, and is the better choice to use for iOS in comparison to Objective-C.
3. Yes, you can use the same language across the platforms you listed in your question, but generally stick with the common languages most people use, as the difficulty increases when you choose more elegant languages, like Prolog or Haskell etc. :)