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执行以下程序后的输出结果是( )。
int n = 23, step = 0;
char op = 'w';
switch (n % 3)
{
case 1:
step = 10;
cout << step;
switch (op)
{
case 'w': cout << "up"; break;
case 'a': cout << "left"; break;
case 'd': cout << "down"; break;
case 's': cout << "back";
}
break;
case 2:
step = 6;
cout << step;
switch (op)
{
case 'w': cout << "run"; break;
case 'd': cout << "walk"; break;
default: cout << "stop";
}
break;
case 3:
step = 1;
cout << step;
}
10run
10stop
6run
6stop
