Array elements are all initialized to the same value problem

One: Initialize with memset Two: Direct initialization when defining data types

#include <iostream>
#include <cstring>
using namespace std;
int main ()
{
	int a[10],b[10],c[10];
        BOOL MAP[10][10];
	memset (A,0x3f,sizeof (a));
	a[2]=0x3f3f3f3f;
        memset (map,false,sizeof (map));//correct 
	memset (b,0,sizeof (b));
	Memset (C,-1,sizeof (c));
	Memset (C,2,sizeof (c)); Error cannot initialize array to 2
	int d[10]={0};//Although the array element is all 0, it is not an int that is obtained by all initialization to zero 
	e[10]={-1};// Unable to initialize all arrays to-1; 
	cout<<a[0]<< ' <<a[1]<<endl;
	cout<<a[2]<<endl;
	cout<<b[0]<< ' <<b[1]<<endl;
	cout<<c[0]<< ' <<c[1]<<endl;
	cout<<d[0]<< ' <<d[1]<<endl;
	cout<<e[0]<< ' <<e[1]<<endl;
}

Three: Default values for arrays not initialized #include  <iostream>   using namespace std;   int a[10];    char b[10];   Int main ()    {       for  ( int i = 0; i < 10; i++)              //int Global Array uninitialized defaults to 0       {            cout << a[i];       }       cout << endl;          int  c[10];       for  (int i = 0; i < 10; i + +)             //Local array is not initialized, random value         {           cout << c[i];  &nbsP     }       cout << endl;           int d[10] = { 0 };        for  (int i = 0; i < 10; i++)              //is 0, an element that is not explicitly initialized defaults to 0, and the character array is ' + '        {            cout << d[i];        }       cout << endl;           cout << b << endl;                      //is output as a string, the output is empty, not a space, You can see that the uninitialized global array element is ' + '        for  (int i = 0; i <  10; i++)             //single output is all a        {           cout << b[i];        }       cout << endl;          char e[10] = {  ' B '  };                           cout << e << endl;         The              //is output as a string, the output is B, and the element that is not explicitly initialized is ' \ 0 '        for  (int i = 0; i < 10; i++)            //char local array, single element outputs result of baaaaaaaaa       {           cout << e[i];       }       cout << endl;        char f[10];                             //char Local Array not initialized , the output is hot hot pressing        for  (int i = 0; i < 10;  i++)                 {            cout << f[i];        }       cout << endl;        return 0;  }