c/c++多維陣列的動態記憶體開闢與釋放
阿新 • • 發佈：2019-01-10
c語言版本
c++版本/************************************************************************/ /* 1、使用C語言方式模擬二維陣列的動態開闢與釋放 2、使用C++ 語言方式模擬二維陣列的動態開闢與釋放 3、擴充套件多維陣列的動態開闢與釋放 */ /************************************************************************/ #include <stdio.h> #include <assert.h> #include <malloc.h> #include <stdlib.h> #include <vld.h> //目標是出現No memory leaks detected #define Type int #define ROW 3 #define COL 4 Type** _Malloc(int row, int col) { Type **p = (Type**)malloc(sizeof(Type*) * row); //申請陣列指標空間 assert(p != NULL); for (int i = 0; i < row; ++i) { p[i] = (Type*)malloc(sizeof(Type)* COL); assert(p[i] != NULL); } return p; } void _Assign(Type **p, int row, int col) { for (int i = 0; i < row; ++i) { for (int j = 0; j < col; ++j) { p[i][j] = i + j; } } } void _Print(Type **p, int row, int col) { for (int i = 0; i < row; ++i) { for (int j = 0; j < col; ++j) { printf("%d ", p[i][j]); } printf("\n"); } } void _Free(Type **p, int row) { for (int i = 0; i < row; ++i) { free(p[i]); } free(p); } int main(int argc, char* argv[]) { Type **p = _Malloc(ROW, COL); _Assign(p, ROW, COL); _Print(p, ROW,COL); _Free(p, ROW); system("pause"); return 0; }
/************************************************************************/ /* 1、使用C語言方式模擬二維陣列的動態開闢與釋放 2、使用C++ 語言方式模擬二維陣列的動態開闢與釋放 3、擴充套件多維陣列的動態開闢與釋放 */ /************************************************************************/ #include <stdio.h> #include <assert.h> #include <malloc.h> #include <stdlib.h> #include <vld.h> //目標是出現No memory leaks detected #define Type int //char int #define ROW 3 #define COL 4 Type** _New(int row, int col) { Type **p = new Type *[row];//申請陣列指標空間 assert(p != NULL); for (int i = 0; i < row; ++i) { p[i] = new Type[col]; assert(p[i] != NULL); } return p; } void _Assign(Type **p, int row, int col) { for (int i = 0; i < row; ++i) { for (int j = 0; j < col; ++j) { p[i][j] = i + j; } } } void _Print(Type **p, int row, int col) { for (int i = 0; i < row; ++i) { for (int j = 0; j < col; ++j) { printf("%d ", p[i][j]); } printf("\n"); } } void _Delete(Type **p, int row) { for (int i = 0; i < row; ++i) { delete[]p[i];//c++ 釋放陣列空間 } delete[]p;//c++釋放陣列 } int main(int argc, char* argv[]) { Type **p = _New(ROW, COL); _Assign(p, ROW, COL); _Print(p, ROW, COL); _Delete(p, ROW); printf("c++\n"); system("pause"); return 0; }
/************************************************************************/ /* 1、使用C語言方式模擬二維陣列的動態開闢與釋放 2、使用C++ 語言方式模擬二維陣列的動態開闢與釋放 3、擴充套件多維陣列的動態開闢與釋放 */ /************************************************************************/ #include <assert.h> #include <malloc.h> #include <stdlib.h> #include <vld.h> #include <iostream> using namespace std; //目標是出現No memory leaks detected #define Type int //char int #define ROW 3 #define COL 4 typedef Type(*Arr)[COL];//陣列指標，開闢COL列陣列 Arr _New() { Arr p = new Type[ROW][COL]; return p; } void _Assign(Arr p) { for (int i = 0; i < ROW; ++i) { for (int j = 0; j < COL; ++j) { p[i][j] = i + j; } } } void _Print(Arr p) { for (int i = 0; i < ROW; ++i) { for (int j = 0; j < COL; ++j) { cout << p[i][j]<<" "; } cout <<endl; } } void _Delete(Arr p) { delete[]p;//c++釋放陣列 } int main(int argc, char* argv[]) { Arr p = _New(); _Assign(p); _Print(p); _Delete(p); system("pause"); return 0; }
/************************************************************************/
/*三維陣列 */
/************************************************************************/
#include <assert.h>
#include <malloc.h>
#include <stdlib.h>
#include <vld.h>
#include <iostream>
using namespace std;
//目標是出現No memory leaks detected
#define Type int //char int
#define ROW 3
#define COL 4
#define Z 3
typedef Type(*Arr)[ROW][COL];//三維陣列指標，開闢COL列陣列
Arr _New()
{
Arr p = new Type[Z][ROW][COL];
return p;
}
void _Assign(Arr p)
{
for (int k = 0; k < Z; ++k)
{
for (int i = 0; i < ROW; ++i)
{
for (int j = 0; j < COL; ++j)
{
p[k][i][j] = i + j+k;
}
}
}
}
void _Print(Arr p)
{
for (int k = 0; k < Z; ++k)
{
for (int i = 0; i < ROW; ++i)
{
for (int j = 0; j < COL; ++j)
{
cout << p[k][i][j]<< " ";
}
}
cout << endl;
}
}
void _Delete(Arr p)
{
delete []p;//c++釋放陣列
}
int main(int argc, char* argv[])
{
Arr p = _New();
_Assign(p);
_Print(p);
_Delete(p);
return 0;
}