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multiarray.cpp
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92 lines (81 loc) · 1.79 KB
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#include <iterator>
#include <iostream>
using int_array = int[4];
int main()
{
int arr[10][20][30] = {0};
int *ptrarr = **arr;
int *endptr = **std::end(arr);
int ct = 0;
for (;ptrarr < endptr; ptrarr++)
{
ct++;
}
std::cout << ct << std::endl;
int ia[3][4] = {
0,1,2,3,4,5,6,7,
{8,9,10,11},
};
for (auto p=*std::begin(ia), q=*std::end(ia); p<q; p++)
{
std::cout << *p << " ";
}
std::cout << std::endl;
int (&row)[4] = ia[1];
constexpr size_t rowCnt = 3, colCnt = 4;
int ia2[rowCnt][colCnt];
for (size_t i = 0; i != rowCnt; ++i)
{
for (size_t j=0; j != colCnt; ++j)
{
ia2[i][j] = i * colCnt + j;
}
}
for (int *p=*ia2, *q=*std::end(ia2); p<q; p++)
{
std::cout << *p << " ";
}
std::cout << std::endl;
size_t cnt = 0;
for (int (&row)[4] : ia)
{
for (auto &col : row)
{
col = cnt;
++cnt;
}
}
std::cout << cnt << std::endl;
for (const auto &row : ia) //must use reference
{
for (auto col : row)
{
std::cout << col << std::endl;
}
}
int (*p)[4] = ia;
p = &ia[2];
for (auto p=ia; p != ia+3; ++p)
{
for (auto q = *p; q != *p+4; ++q)
{
std::cout << *q << ' ';
}
}
std::cout << std::endl;
for (auto p = std::begin(ia); p != std::end(ia); ++p)
{
for (auto q = std::begin(*p); q != std::end(*p); ++q)
{
std::cout << *q << ' ';
}
}
std::cout << std::endl;
for (int_array *p = ia; p != ia+3; ++p)
{
for (int *q = *p; q != *p+4; ++q)
std::cout << *q << ' ';
}
std::cout << std::endl;
return 0;
}