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function c++ code, which I did not understand. Especially for the first void function and int main(), I do not understand why the first void function enter the number and the int main function print out the final answer.    #include

function c++ code, which I did not understand. Especially for the first void function and int main(), I do not understand why the first void function enter the number and the int main function print out the final answer.    #include

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Please help me explain the following void function c++ code, which I did not understand. Especially for the first void function and int main(), I do not understand why the first void function enter the number and the int main function print out the final answer. 

 

#include <iostream>
using namespace std; 

void getNumber(int *input); 
void doubleValue(int *val); 

int main()
{
    int number; 
    getNumber(&number);
    doubleValue(&number); 
    
    cout<<"That value doubled is"<<number<<endl; 
    
    return 0;
}
void getNumber(int *input)
{
    cout<<"Enter an integer number:"; 
    cin>>*input; 
}
void doubleValue(int *val)
{
    *val *=2;
}

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