Arrays in C++ Post: 302584573

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Top Forums Programming Arrays in C++ Post 302584573 by John Tate on Friday 23rd of December 2011 05:03:25 PM

12-23-2011

Registered User

Arrays in C++

I've noticed something interesting in C++ programming. I've always done tricky stuff with pointers and references to have functions deal with arrays. Doing exercises again out of a C++ book has shown me an easier way, I didn't even know was there. It's weird to me.

When dealing with arrays, it seems if I pass an array to a function although I cannot return an array - if the array is changed it changes for the whole program. The array is seemingly global. Hence this code works (GCC 4.7)...

Code:

#include <iostream>

using namespace std;

int read_inputs(double inputs[], int capacity) {
    int current_size = 0;
    cout << "Please enter values, Q to quit:"<<endl;
    bool more = true;
    while (more)
    {
        double input;
        cin >> input;
        if (cin.fail()) {
            more = false;
        } else if (current_size < capacity) {
            inputs[current_size] = input;
            current_size++;
        }
    }
    return current_size;
}

void multiply(double values[], int size, double factor)
{
    for (int i = 0; i < size; i++)
    {
        values[i]=values[i] * factor;
    }
}

void print(double values[], int size)
{
    for (int i = 0; i < size; i++)
    {
        if (i > 0) {cout << ", ";}
        cout << values[i];
    }
    cout << endl;
}

int main() {
    const int CAPACITY = 1000;
    double values[CAPACITY];
    int size = read_inputs(values, CAPACITY);
    print(values, size);
    multiply(values, size, 2);
    print(values, size);

    return 0;
}

John Tate

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LEARN ABOUT PHP

array_merge_recursive

ARRAY_MERGE_RECURSIVE(3)						 1						  ARRAY_MERGE_RECURSIVE(3)

array_merge_recursive - Merge two or more arrays recursively

SYNOPSIS

       array array_merge_recursive (array  $array1, [array  $...])

DESCRIPTION

       array_merge_recursive(3) merges the elements of one or more arrays together so that the values of one are appended to the end of the previ-
       ous one. It returns the resulting array.

	If the input arrays have the same string keys, then the values for these keys are merged together into an array, and this is  done  recur-
       sively,	so  that  if one of the values is an array itself, the function will merge it with a corresponding entry in another array too. If,
       however, the arrays have the same numeric key, the later value will not overwrite the original value, but will be appended.

PARAMETERS

	      o $array1
		- Initial array to merge.

	      o $...
		- Variable list of arrays to recursively merge.

RETURN VALUES

	An array of values resulted from merging the arguments together.

EXAMPLES

       Example #1

	      array_merge_recursive(3) example

	      <?php
	      $ar1 = array("color" => array("favorite" => "red"), 5);
	      $ar2 = array(10, "color" => array("favorite" => "green", "blue"));
	      $result = array_merge_recursive($ar1, $ar2);
	      print_r($result);
	      ?>

	      The above example will output:

	      Array
	      (
		  [color] => Array
		      (
			  [favorite] => Array
			      (
				  [0] => red
				  [1] => green
			      )

			  [0] => blue
		      )

		  [0] => 5
		  [1] => 10
	      )

SEE ALSO

       array_merge(3), array_replace_recursive(3).

PHP Documentation Group 												  ARRAY_MERGE_RECURSIVE(3)

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