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This article mainly introduces "how to use function pointers in C language". In daily operation, I believe that many people have doubts about how to use function pointers in C language. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the question of "how to use C language function pointers"! Next, please follow the editor to study!

Definition method

For a function as follows:

Func (,...) The format of the function pointer is (*) (,.) The following is an example:

Define a function pointer as follows

Int main (int argc, char* argv []) {double (* a) (int N1 pointer N1) = NULL;} where a means a pointer to a function whose parameter is integer N1, integer N2, and the return value is double. The parameter name can be omitted in the actual operation, leaving only the parameter type, as follows: double (* a) (int, int) = NULL The following points to the function that returns a pointer: double* (* a) (double*, int) = foo; assignment method

The function name is actually the address of the function. We just need to assign this address to the function pointer, as follows

# includedouble* foo (double* a, int b) {return a;} int main (int argc, char* argv []) {double* (* a) (double*, int) = foo;} through debugging, we can easily see the values of foo and a:

Use

Function pointer a can be used as a variable of another function b to run function an in function b.

Function pointers can be used as a field of structures, just like class functions in C++

At this point, the study of "how to use function pointers in C language" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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