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C++ Language > Learn C++ Language > How do you link a C++ program to C functions?
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How do you link a C++ program to C functions?

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Computer Programming

Just include hedears file
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If you want to use existing C functions in the C++ program, you can make use of "extern C". The compiler output for both C and C++ would be different. Extern C would give an indication to the C++ compiler to generate compiled output of the respective function in C format.
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Experienced IT Trainer with 17 years of experience in IT Industry

In order to call a C function from C++ code, you would use the “extern “C”” keyword when declaring the function in C. Then, you would call the function just like you would call any other function. An example will help clarify this: /*this is what the C++ code would look like for the declaration...
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In order to call a C function from C++ code, you would use the “extern “C”” keyword when declaring the function in C. Then, you would call the function just like you would call any other function. An example will help clarify this: /*this is what the C++ code would look like for the declaration of the foo function, which is defined somewhere else in C code: */ extern "C" void foo( ); And then to call the function in the C++ code, it would look like this: //the declaration: extern "C" void foo(); void main() { // the function call: foo( ); } read less
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To call a C function from C++ code, you would use the “extern “C”” keyword when declaring the function in C. Then, you would call the function just like you would call any other function.
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In the C++ code you need to declare the C function as extern "C"
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