A method to assign the same value to all elements in an array

Question

Is there anyway to do this? This is my first time using an array and its 50 elements and i know they will only get bigger.

Answer 1

Whatever kind of array you are using, if it provides iterators/pointers you can use the std::fill algorithm from the <algorithm> header.

// STL-like container:
std::fill(vect.begin(), vect.end(), value);

// C-style array:
std::fill(arr, arr+elementsCount, value);

(where value is the value you want to assign and elementsCount is the number of elements to modify)

Not that implementing such a loop by hand would be so difficult...

// Works for indexable containers
for(size_t i = 0; i<elementsCount; ++i)
    arr[i]=value;

Answer 2

使用std::vector ：

std::vector<int> vect(1000, 3); // initialize with 1000 elements set to the value 3.

Answer 3

You can use a for loop if you must use arrays:

int array[50];

for (int i = 0; i < 50; ++i)
    array[i] = number; // where "number" is the number you want to set all the elements to

or as a shortcut, use std::fill

int array[50];

std::fill(array, array + 50, number);

If the number you want to set all the elements to is 0 , you can do this shortcut:

int array[50] = { };

Or if you're talking about std::vector , there is a constructor that takes the initial size of the vector and what to set each element to:

vector<int> v(50, n); // where "n" is the number to set all the elements to.

Answer 4

for(int i=0;i<sizeofarray;i++)
array[i]=valuetoassign

using method


void func_init_array(int arg[], int length) {
  for (int n=0; n<length; n++)
   arg[n]=notoassign
}