C language: the function pointer is used to add, subtract, multiply, and divide two numbers (the function pointer is used as a parameter ).

C language: the function pointer is used to add, subtract, multiply, and divide two numbers (the function pointer is used as a parameter ).

//

// Main. c

// Function_pointer

//

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

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

// Requirement: Use the function pointer as a parameter to calculate the sum, difference, product, and Quotient of two integers.

 

// Knowledge point: a function pointer is a pointer to a function. It points to the function to be called to complete the operation. In fact, this pointer is the entry address pointing to the function.

// 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 function (int (* p) (int, int); // set the function pointer as a parameter.

// P is a pointer variable pointing to a function. It can point to a function with an integer type and two integer parameters. The p type is represented by 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;

}