Interchanging variables between functions

[Roberto Dias]

What about to interchange variables between functions? Which are the
best way to do this? I know that this is a fundamental question, but I
C++ fundamental student yet. I just started few day ago on studying
about functions and I'm so excited to implement some ideias about text
files processing.

thanks,

Roberto Dias

 

[Thomas Matthews]

What about to interchange variables between functions? Which are the
best way to do this? I know that this is a fundamental question, but I
C++ fundamental student yet. I just started few day ago on studying
about functions and I'm so excited to implement some ideias about text
files processing.

thanks,

Roberto Dias

There are two methods: Pass pointers to the variables or
have the function require references.

#include <iostream>
#include <cstdlib>
using namespace std;

void Add_Five(unsigned int& num)
{
num += 5;
return;
}

void Add_Ten(unsigned int * p_num)
{
*p_num += 10;
return;
}

int main(void)
{
unsigned int orig_num = 2;

cout << "Original number: " << orig_num << endl;

Add_Five(orig_num);
cout << "After call to Add_Five: "
<< orig_num << endl;

Add_Ten(&orig_num);
cout << "After call to Add_Ten: "
<< orig_num << endl;

return EXIT_SUCCESS;
}


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Thomas Matthews

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