C language: the function pointer is used to add, subtract, multiply, and divide two numbers.

C language: the function pointer is used to add, subtract, multiply, and divide two numbers.

//

// Main. c

// Function_pointer

//

// Created by mac on 15/8/2.

// Copyright (c) 2015 bjsxt. All rights reserved.

// Requirement: Calculate the sum, difference, product, and Quotient of two integers by using the function pointer.

 

// Knowledge point: a function pointer is a pointer to a function. It points to the function to be called to complete the operation.

// Remember: the function to be called must be the same as the declared function pointer (including the return value type, number of parameters, 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 (* p) (int, int); // defines the function pointer

P = add; // pointer to addition Function

Printf ("add = % d \ n", p (20, 10 ));

P = sub; // pointer to the subtraction Function

Printf ("sub = % d \ n", p (20, 10 ));

P = mult; // pointer to multiplication function

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

P = divi; // pointer to Division Function

Printf ("divi = % d \ n", p (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;

}