C++ Arrays

An array is a one of the data structure in C++, that can store a fixed-size sequential collection of elements of the same data type.

Define an Array in C++

type arrayName [ arraySize ];

An array type can be any valid C++ data types, and array size must be an integer constant greater than zero.

double salary[15000];

Initialize an Array in C++

Arrays can be initialized at declaration time:

int age[5]={22,25,30,32,35};

Initializing each element separately in the loop:

int newArray[5];
int n = 0;

// Initializing elements of array seperately
for(n=0;n<sizeof(newArray)/sizeof(newArray[0]);n++)
{
  newArray[n] = n; 
}

A Pictorial Representation of the Array

Accessing Array Elements in C++

int newArray[10];
int n = 0;

// Initializing elements of array seperately
for(n=0;n<sizeof(newArray)/sizeof(newArray[0]);n++)
{
  newArray[n] = n;
}

int a = newArray[5]; // Assigning 5th element of array value to integer 'a'.

#include <iostream> 
using namespace std;
 
#include <iomanip> 
using std::setw;

int main () {

   int newArray[5];
   int n = 0, p =0;

   // Initializing elements of array seperately         
   for (n=0; n<sizeof(newArray)/sizeof(newArray[0]); n++) {
      newArray[n] = n+50;
   }
   // print heading
   cout << "Element" << setw(10) << "Value" << endl;
   
   // print element's value in loop                    
   for (p=0; p<sizeof(newArray)/sizeof(newArray[0]); p++) {
      cout << setw(5) << p << setw(10) << newArray[p] << endl;
   }
   return 0;
}

Element     Value
    0        50
    1        51
    2        52
    3        53
    4        54