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];1d fixed length arrays c++
void initarr(int arrgender[TOT_MALE][TOT_FEMALE])
{
for(int a =0; a < TOT_MALE;a++)
{
for(int b = 0; b < TOT_FEMALE;b++)
{
arrgender[a][b] = 0;
}
}Copyright © 2021 Codeinu
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