题目内容
（请给出正确答案）
I've been going home for lunch ever since I started school. I never liked eating in the ca
Mom is always there; she had soup ready in the breakfast room by the time that Ann and Jim and I get home. Ann and Jim have never gone in for the cafeteria, either. Our house in only about a ten-minute walk from the school building, so we can make it back in plenty of time.
There's something about eating in the cafeteria--and not leaving the high school from morning until afternoon -- that feels a little like being in prison. By the end of the morning, I've got to get out of the building. And Mom never seems to mind fixing lunch for us; she never suggests that we eat in the cafeteria.
It's really the only time we have to be alone with her. In the morning Dad's there, and by the time I get home after messing around(混时间) after school, he's usually at home from work. So the time that Mom and I talk together is usually at lunch.
I feel sorry for the students who eat in the cafeteria every day. It would drive me mad, I don't know if their moms just don't like to cook for them in the middle of the day, or if they actually like the cafeteria and the cafeteria food.
When the author was in junior high school, ______.
A．he never ate in the cafeteria
B．he ate in the cafeteria sometimes but not often
C．he always went back for lunch
D．he often ate in the cafeteria
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提示：补充横线上的代码，请使用英文半角输入，不要留空格及其他不可见字符。 #include <stdio.h> #include <string.h> int add(int x, int y) { return x + y; } int sub(int x, int y) { return x - y; } int mul(int x, int y) { return x * y; } int div(int x, int y) { return x / y; } int (*func[])(int ,int) = { add,sub,mul,div }; int num, curch; char chtbl[] = "+-*/()="; char corch[] = "+-*/()=0123456789"; int getach() { int i; while (1) { curch = getchar(); if (curch == EOF) return -1; for (i = 0; corch[i] && curch != corch[i]; i++); if (i < strlen(corch)) break; } return curch; } int getid() { int i; if (curch >= '0' && curch <= '9') { for (num="0;" curch>= '0' && curch <= 10 '9'; getach()) num="num" * + curch - '0'; return -1; } else { for (i="0;" chtbl[i]; i++) if (chtbl[i]="=" curch) break; getach(); i; int cal() x1, x2, x3, op1, op2, i="getid();" 4) x1="cal();" op1="getid();" (op1>= 5) return x1; i = getid(); if (i == 4) x2 = cal(); else x2 = num; op2 = getid(); while (!(op2 >= 5)) { i = getid(); if (i == 4) x3 = cal(); else x3 = num; if ((op1 / 2 == 0) && (op2 / 2 == 1)) x2 = (*func[op2])(x2, x3); else { x1 = (*func[op1])(x1, x2); x2 = x3; ____________________; } op2 = getid(); } return (*func[op1])(x1, x2); } void main() { int value; printf("Please input an expression:\n"); getach(); while (curch != '=') { value = cal(); printf("The result is : %d\n", value); printf("Please input an expression:\n"); getach(); } }
