C++ 全局变量和局部变量初始化

#include 

using namespace std;

char c1[10] = {};
int i1;

int main(){
    char c2[5] = {};
    int i2;

    cout << "c1[0]: " <<  c1[0] << 't' << endl;
    cout << "c2[0]: " <<  c2[0] << 't' << endl;

    cout << i1 << endl;
    cout << i2 << endl;

    return 0;
}

运行结果：

c1[0]: 
c2[0]: 
0
0

#include 

using namespace std;


int main()
{
	int *p;
    cout << p << endl;
    // cout << *p << endl;
}

运行结果：

0