[問題] 我想請問下列幾提問題請高手指導!
我想請問幾個問題
(1) If an array has been declared this way:
#define MAX 5
int prices[MAX];
What’s wrong in the following statements ?
for (j=0; j<=MAX; j++)
prices[j] = 3;
A:因為MAX設定為5所以矩陣為1*5的矩陣，其中迴圈寫法for (j=0; j<=MAX; j++)矩陣
會變成1*6的矩陣錯，要把j<=MAX改為j<MAX才正確。
(2) int vox = 4;
int *invox = &vox;
Which of the following expression is true? 可複選
a. if (vox == &invox)
b. if (vox == *invox)
c. if (invox == *vox)
d. if (invox ==&vox)
這提指標就不太會了，請高手說明指導謝謝!
(3) Execution of the following function may cause the system crash. What
statement must be added to the following statements to make it functions
correctly ?
main()
{
int j, *ptr2j; //ptr2j will be a pointer to j
********** 這行程式要怎們加 what statement shall be added?
*ptr2j = 3;
}
指標我真的不太會了，請高手說明指導謝謝!
(4) What does the expression (0xF0 | 0x32) evaluate to ?
a. 0x32
b. 0xF0
c. 0xF2
d. 0x00
A: 為 OR閘 答案C
(5) unsigned int num = 0xF000;
what does (num >>8) evaluate to ?
a. 0x000f
b. 0x00f0
c. 0xff00
d. 0xfff0
A:往右搬8位元 答案為b
謝謝各位撥空回答
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