include void main(){ int x=1, y=0, a=0, b=0;   switch (x)   { case 1:    switch(y)    { case 0: a++; break;      case 1: b++; break;    }     case 2: a++; b++; break;     case 3: a++; b++;  }  printf(“a=%d, b=%d”, a, b);}程序的运行结果是__。a=2,b=1

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