initialize an array in c++
int nums[100] = {0}; // initiallize all values to 0
int nums[5] = {1,2,3,4,5};
// type name[size] = {values};initialize an array in c++
int nums[100] = {0}; // initiallize all values to 0
int nums[5] = {1,2,3,4,5};
// type name[size] = {values};number of elements in c++ array
#include <iostream>
using std::cout;
int a[] = { 1, 2, 3, 4, 5 };
int counta()
{
return sizeof( a ) / sizeof( a[ 0 ] ); // works, since a[] is an array
}
int countb( int b[] )
{
return sizeof( b ) / sizeof( b[ 0 ] ); // fails, since b[] is a pointer
}how to make an array c++
int foo [] = { 16, 2, 77, 40, 12071 };arrays in c++
#include <iostream>
#include <array> //for using std::array
int main()
{
int example[5];//array on stack
int* another = new int[5];//array on heap
delete[] another;//freeing up memory on heap
example[0] = 1;
example[1] = 2;
example[2] = 3;
example[3] = 4;
for (int i = 0; i < 5; i++) {
example[i] = 2;
}
int* ptr = example;//arrays are just pointers to the begining of the block of memory
example[2] = 5;
*(ptr + 2) = 6;//adding 4+4 bytes to ptr
std::cout << example[2] << std::endl;//output => 6
*(int*)((char*)ptr + 8) = 8;//adding 8 bytes to ptr using ptr arithmetic
std::cout << example[2] << std::endl;//output => 8
//std::array provide some additional functionality like bounce checking size checking but do have a performance overhead
std::array<int,5> stda;//creating an array named stda of int 5 size
std::cout << stda.size() << std::endl;//will output size of std::array ,output =>5
std::cin.get();
}array declaration c++
int foo [5];array c++
// An example of using std::array
// Basic syntax: std::array<TYPE, SIZE> NAME;
// Note that the size must be a constant
#include <iostream>
#include <array> // Use std::array
int main() {
std::array<int, 10> arr;
arr[0] = 5; // Setting an element
std::cout << arr[0] << std::endl; // Element access
std::cout << arr.at(0) << std::endl; // Element access with bounds checking
}Copyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us
