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C/C++ Language Interface
Mathematica supports several levels of interfacing to C and C++ programs. You can create "installable" C programs where C functions are directly connected to Mathematica functions. You can use C to call Mathematica through MathLink and get full access to its capabilities. And you can create C program fragments and modify C source code.
Calling C Programs from Mathematica »
Install — load an installable MathLink program
.tm — template file for connecting C and Mathematica functions
mcc, mprep — scripts for building MathLink programs
MLEvaluate() — call back into Mathematica
    
Calling Mathematica from C Programs »
MLPutInteger32()  ▪ MLGetInteger32()  ▪ MLPutString()  ▪ MLPutFunction()  ▪ ...
MLOpenString()  ▪ MLNextPacket()  ▪ MLReady()  ▪ ...
    
Wolfram Library Link »
LibraryFunctionLoad — load a function from a dynamic library into Mathematica
LibraryFunction — a function that calls into a dynamic library
LibraryFunctionInformation  ▪ LibraryFunctionUnload  ▪ LibraryLoad  ▪ LibraryUnload  ▪ FindLibrary  ▪ $LibraryPath  ▪ ...
    
Calling C Compilers from Mathematica »
CreateExecutable — create an executable from C code
CreateLibrary — create a library from C code
    
Generating C Code »
Export — export a Mathematica compiled function into C code
CCodeGenerate — export a Mathematica compiled function into C code
CCodeStringGenerate  ▪ SymbolicCGenerate  ▪ LibraryGenerate
CForm — convert an expression to C language form
Splice — splice Mathematica output into C source files
    
Symbolic Representation of C Code »
CFunction — symbolic representation of a C function
CCall — symbolic representation of a C function call
CAddress  ▪ CAssign  ▪ CBlock  ▪ CDeclare  ▪ CIf  ▪ CPointerType  ▪ CStruct
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