C语言动态数组

#define _CRT_SECURE_NO_DEPRECATE
#include<stdio.h>
#include<stdlib.h>
void createOneDimensionalVector(){
    int n, i;
    int *arr;
    scanf("%d",&n);
    arr = (int*)malloc(sizeof(int)*n);
    for (i = 0; i < n; i++)
        arr[i] = i;
    for (i = 0; i < n; i++)
        printf("%d\t",arr[i]);
}

int main(){
    createOneDimensionalVector();

    return 0;
}

void createTwoDimensionalVector(){
    int n=3, m=4;
    int** a;
    a = (int**)malloc(sizeof(int*)*n);//创建一个指针数组，把指针数组的地址赋值给a
    for (int i = 0; i < n; i++)
        a[i] = (int*)malloc(sizeof(int)*m);//给第二维分配空间

    for (int i = 0; i < n; i++){
        for (int j = 0; j < m; j++)
            a[i][j] = i + j;
    }

    for (int i = 0; i < n; i++){
        for (int j = 0; j < m; j++)
            printf("%d\t",a[i][j]);
        printf("\n");
    }
}
int main(){
    createTwoDimensionalVector();

    return 0;
}