[問題] 100台聯大計概考古

[fb74123698 (PP瑄)]

4.Consider the C program on the right side.What will be printed on the standard output after program finishes?

struct point{int x;int y;};

int main(){
  struct point p,q;
  struct point *r;
  r=&q;
  q.x=p.y=1;
  q.y=p.x=2;
  r->x=2;
  p.y=1;
  printf("%d,%d",q.x,q.y);
  return 0;
}
A.2,2 B.2,1 C.1,2 D.1,1 E.none of the above

2.A 2D array X[1...10][1...100]is declared in a program.The address of X[1][1]is 1200,and the size of each element of the array is 4.What address of X[3][2]is if the memory system uses row majar storage?

A.1232
B.1264
C.1328
D.2408
E.none of the above

請問這兩題的答案怎麼算


第二題 我算出來都不是ABCD裡..

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推 forris:第二題我算是 2004
→ forris:第一題是 A 嗎？
推 forris:用程式跑一次, 第一題是 A 無誤。
→ forris:第一題重點在 call-by-reference. r & q 共用記憶體空間
→ forris:原本 q.x = 1, 後來 r.x = 2 --> q.x = 2
→ fb74123698:第二題我也算2004,沒在答案上比較不放心..第一題大概了
→ fb74123698:解了,不過細微的得自己再去弄懂,真的謝謝你!