changing an array

[antijock]

two things;
1: how do u make an array start with element 1 instead of element 0
or should i not do that?
2: is there a simple way to add up all the values stored within an array?

I'm using MS visual C++ 6.0

thanks alot

(ugh my bad, i said '2' instead of '0' fixed it though.)

[MXP]

1. I dont understand

2. Yes

Code: Select all

int sum;
for (int i = 0; i < sizeof(array); i++)
    sum += array[i];


[punkrockguy318]

1.You can't. Kindof think as the array number as an offset of the first element in the array(array[3] is 3 elements away from array[0])[/code]

[omnius]

Code: Select all

int sum;
for (int i = 0; i < sizeof(array); i++)
    sum += array[i];

Prefer instead:

Code: Select all

int sum;
for (int i = 0; i < sizeof(array)/sizeof(array[0]); i++)
    sum += array[i];

[raimo]

The simplest I know is

Code: Select all

#include <numeric>
...
int sum = std::accumulate(array, array + sizeof(array)/sizeof(array[0]), 0);


[Alvaro]

The first thing is, get used to counting from 0. Life is easier that way.

If, for some strange reason, you really want an array that starts at a different number, I just happen to have a solution for you.

int real_underlying_array[100];
int * const fake_array = &real_underlying_array[-1];

Two days ago I used this for the first time. Actually, I wanted to start counting at -34, and I had good reasons for that, but it's a long story.