malloc 申请二维数组

函数打包版


#include <malloc.h>
#include <stdio.h>
#define ROW   4
#define LINE  5

int ** getArray(int row, int line)
{
    int **p = NULL;
    int i =0;
    p = (int**)malloc(sizeof(int*)*row);
    for(; i<row; i++)
        p[i] = (int*)malloc(sizeof(int)*line);
    return p;
}
void freeArray(int **p, int row)
{
    int i,j;
    for(i=0; i<row; i++)
        free(p[i]);
    free(p);

}

int main()
{
    int **p2Array = getArray(ROW,LINE);

    int i,j;
    for(i=0; i<ROW; i++)
    {
        for(j=0; j<LINE; j++)
        {
            p2Array[i][j] = i+j;
        }
    }


    for(i=0; i<ROW; i++)
    {
        for(j=0; j<LINE; j++)
        {
            printf("%d  ",p2Array[i][j]);
        }
        putchar(10);
    }
    freeArray(p2Array,ROW);
    return 0;
}

-------------------------------------------------------------------------------------------------------------------------------
#include <malloc.h>
#include <stdio.h>
#define ROW   4
#define LINE  5



int * getArray(int row, int line)
{
    int *p = malloc(sizeof(int)*row*line);
    return p;
}
void freeArray(int *p)
{
    free(p);
}

int main()
{
    int (*p2Array)[LINE] = (int(*)[LINE]) getArray(ROW,LINE);

    int i,j;
    for(i=0; i<ROW; i++)
    {
        for(j=0; j<LINE; j++)
        {
            p2Array[i][j] = i+j;
        }
    }


    for(i=0; i<ROW; i++)
    {
        for(j=0; j<LINE; j++)
        {
            printf("%d  ",p2Array[i][j]);
        }
        putchar(10);
    }
    freeArray(p2Array);
    return 0;
}

其本格式

#include <malloc.h>
#include <stdio.h>
int main()
{
    int (*a)[2] = malloc(sizeof(int)*3*2);
    a[0][0] =1;
    a[0][1] =2;
    a[1][0] =3;
    a[1][1] = 4;
    a[2][0] =5;
    a[2][1] = 6;
    printf("%d\t%d\t%d\t%d\t%d\t%d\n",a[0][0],a[0][1],a[1][0],a[1][1],a[2][0],a[2][1]); 
    free(a);
    system("pause");
}
 
 
或者：
#include <malloc.h>
#include <stdio.h>
int main()
{
    int **a = malloc(sizeof(int)*3);
    a[0]= malloc(sizeof(int)*2);
    a[1]= malloc(sizeof(int)*2);
    a[2]= malloc(sizeof(int)*2);
    a[0][0] =1;
    a[0][1] =2;
    a[1][0] =3;
    a[1][1] = 4;
    a[2][0] =5;
    a[2][1] = 6;
    printf("%d\t%d\t%d\t%d\t%d\t%d\n",a[0][0],a[0][1],a[1][0],a[1][1],a[2][0],a[2][1]); 
    free(a[0]);
    free(a[1]);
    free(a[2]);
    free(a);
    system("pause");
}