[单选]  以下程序运行后,输出结果是#include #include using namespace std;int main(int argc, char* argv[]){    static char a[]="ABCDEFGH",b[]="abCDefGh";    char *p1,*p2;    int k;    p1=a; p2=b;    for(k=0;k<=7;k++)        if (*(p1+k)==*(p2+k))            cout<<*(p1+k);    return 0;}