CONVERT INTEGER ARRAY INTO AN INTEGER

Projects General Guidance
1

Hi,
I want some way so that I can convert an integer array like

int a[2] = {1,2};

to an integer
(k = 12;)

I got this function "atoi" when I googled it but this function only converts the character array to integer, like, the function which can convert the array 'a' to variable 'k'.

2

Simple decimal arithmetic.

Why so shouty?

3 
int number = 0;
for (int i=0; i< length(array); i++) number *= 10 + array[i];