C: two-digit subtraction with function pointers (function pointers as parameters)

//

Main.c

Function_pointer

//

Created by Mac on 15/8/2.

Copyright (c) 2015 BJSXT. All rights reserved.

Requirements: The function pointer is a parameter to find two integers and, difference, product, quotient.

Knowledge Point: A function pointer is a pointer to a function that completes the operation by pointing to the function to be called. In fact, this pointer is the entry address that points to the function.

Remember: The function to be called must be the same as the declaration of the function pointer (includes: Return value type, number of arguments, and type)

#include <stdio.h>

int add (int, int);

int sub (int, int);

int mult (int, int);

int divi (int, int);

int main (int argc, const char * argv[])

{

int function (int (*p) (Int,int)); //Use function pointers as parameters

P is a pointer variable to a function that can point to a function whose type is integral and has two integer arguments. The type of P is represented by an int (*) (Int,int)

printf ("Add =%d\n", add (20,10));

printf ("Sub =%d\n", sub (20,10));

printf ("mult =%d\n", mult (20,10));

printf ("divi =%d\n", Divi (20,10));

return 0;

}

int add (int a,int b)

{

return a+b;

}

int sub (int a,int b)

{

return a-B;

}

int mult (int a,int b)

{

return a*b;

}

int divi (int a,int b)

{

return a/b;

}

C: two-digit subtraction with function pointers (function pointers as parameters)