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Why do programmers use multiple languages?
The answer to why we have different programming languages is because they do different things to some degree. The real answer is that some programming nerd (in the most endearing way) thought they could make a better language that (likely) reflects modern needs and styles.
Can programming languages work together?
Language interoperability is the capability of two different programming languages to natively interact as part of the same system and operate on the same kind of data structures. NET CLI compliant languages in the Common Language Runtime and JVM compliant languages in the Java Virtual Machine).
How to run multiple scripts at the same time?
Suppose I want to run five different scripts at 3 PM on every Saturday and I want to put all these scripts in a single script and run it using cron. Note that using semicolons means that job2 (and job3) run no matter whether the previous jobs were successful (RC=0) or not. Use && between them if you wish to change that.
Is it common to have multiple languages in one project?
Having multiple languages in one project is actually quite common, however the principles behind are not always simple. In the simple case, different languages are compiled to the same code.
Is it possible to mix different programming languages?
Languages are rarely mixed within files, and when they are, it is for laughs. People even try to avoid mixing languages within projects because of the extra hassle it introduces. So, while it can be technically possible, mixing different languages is neither common nor pragmatic.
How are different languages compiled to the same code?
In the simple case, different languages are compiled to the same code. For example, C and C++ code typically is compiled into machine assembler or C# and VB.Net is compiled into IL (the language understood by the .NET runtime).