What computer programs/ programming languages do you use most ?

I've used C, C++, Java, JavaScript (yes, for Mathematics), Perl (for some Mathematics)... now I'm learning Common Lisp...

Of course, ForTran is the biggie for hardcore Mathematics..

I recommend you give Lisp a look... see my blog...

Happy New Year..

p.s: Python has good Math Libraries...

OOP languages, like C++. Object oriented languages are ideal for simulation, real time codes. Ada, a derivative of Pascal, is also OK for simulation or real time code, like for guidance systems.

A good statistic package (like Systat or SAS), is a necessity if you are studying upper level classes where statistics are paramount. Excel has a statistics template add on you can use for some pretty complex business statistics. [See source.]

MATLAB is a sophisticated, but complex math software application that can be used for graphing, data analysis, and so on. You can even solve multiple dynamic systems math. A lot of organizations use it; so its results are generally accepted across companies.

I would start with Excel and, perhaps, Systat or SAS before hitting the books in college. Excel is intuitive, has excellent built in help, and can do some pretty sophisticated math and statistics. Use the statistics software only if you anticipate a heavy dose of statistics in college. Otherwise, the Excel statistics are pretty good for most work.

For the statistics courses, SAS and Stata (R is also free and I'm trying to pick this up on my own).

For graduate level finance/macroeconomics courses, along with anything else that uses differential equations, C++ is incredibly helpful. Java is easy to learn if you already known C++.

Mathematica is heavily based on C++.

In short - learn C++ first! Everything else stems from this language and knowledge of OOP.

The top-level languages like VB are very easy to pick up on your own, I use them personally occasionally but never for anything math related.

SAS and Stata are very hard to learn outside of an environment where you're also learning mathematical statistics.

Mathematica is easy to learn on your own, and some schools (such as University of Illinois) integrate it heavily into their undergrad math curriculum.

Perl, for useful scripts to sophisticated models.

Mathematica, for all the numerical analysis.

Unix, because you will have to learn it eventually if you are on enough networks.

LaTeX, for all of the word processing.

Excel, for doing simple operations on many groups of numbers.

LaTeX is free and incredibly useful.

Microsoft Excel: I know people like to rip on Microsoft, but this one is real handy.

Instead of Mathematica, people will often use Maple or Matlab. Which is best is a matter of opinion (that is my opinion).

there're some essential programs i often use like MATLAB and PSpice.

for the programming languages, i'm learning Java and C#.

and VHDL is also very useful

C++

I have used only java and c++

matlab, Visual C, visual basic