C/C++ Basics–function pointer

1.basic concepts

    function pointer in C/C++ is just like delegate in C#. we can use function pointer to point to a specific function, and then use function pointer to invoke the specified function.

    eg.

    int max(int a,int b)

    {

    return a>b?a:b;

    }


    void main()

    {

    int (*p)(int,int); //declare a function pointer

    p=max;//the function point must has the same return type and parameter type with specified function.

    printf("max(2,3) is %d",p(2,3));

    }

    //the result is 3;


also , we can use typedef to define a function pointer type to simplify the programming.

eg.

    #typedef int (*MyFunPointer)(int a,int b);
    //we define a function pointer type which has int return type and has two int parameters.

    void main()

    {

    MyFunPointer p;
    p=max;

    printf("max(2,3) is %d",p(2,3));

    }