题目

Suddenly Uncle Henry stood up. “There’s a cyclone coming, Em,” he called to his wife. “I’ll go look after the stock.” Then he ran toward the sheds where the cows and horses were kept.Aunt Em dropped her work and came to the door. One glance told her of the danger close at hand. “Quick, Dorothy!” she screamed. “Run for the cellar!” Toto jumped out of Dorothy’s arms and hid under the bed, and the girl started to get him. Aunt Em, badly frightened, threw open the trap door in the floor and climbed down the ladder into the small, dark hole. Dorothy caught Toto at last and sta按照下图所示的操作步骤，若输入的x的值为-1，则输出的y的值为-2-2．