memcpy && memcmp

#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cctype>
#include <cstdlib>
#include <cmath>
#include <stack>
#define M 10000

using namespace std;

typedef struct Node{
    int x;
    int y;
}Node;

Node m[M];
Node n[M];

int main()
{
    freopen("in.in","r",stdin);

    for(int i = 0;i < M;i++)
     m[i].x = m[i].y = i;

    memcpy(n,m,sizeof(m[0])*M);

    for(int i = 0;i < 10;i++)
     printf("%d %d\n",n[i].x,n[i].y);

    int a[3] = {1,2,3};
    int b[3] = {4,2,3};

    int temp = memcmp(a,b,sizeof(int)*3);   //遇到不相同元素是  a [i] > b[i] 则返回1 a[i] < b[i]  返回 -1   全部相同返回 0

    printf("temp = %d\n",temp);

    return 0;
}