【C#-題庫】控制結構
1．底下的程式碼會印出？
int i = 0, j = 0;
label:
i++;
j+=i;
if (i < 10)
{
Console.Write(i +" ");
goto label;
}
A. 印出1 到 9
B. 印出0 到 8
C. 印出2 到8
D. 印出2 到9
E. 在標籤label處發生編譯錯誤
Answer: Option A
2．下面程式片段輸出為何？
int i = 20 ;
for( ; ; )
{
Console.Write(i + " ");
if (i >= -10)
i -= 4;
else
break;
}
A. 20 16 12 84 0 -4 -8
B. 20 16 12 8 4 0
C. 20 16 12 8 4 0 -4 -8 -12
D. 16 12 8 4 0
E. 16 8 0 -8
Answer: Option C
3．底下程式片段輸出為何？
namespace IndiabixConsoleApplication
{
public enum color
{ red, green, blue };
class SampleProgram
{
static void Main (string[ ] args)
{
color c = color.blue;
switch (c)
{
case color.red:
Console.WriteLine(color.red);
break;
case color.green:
Console.WriteLine(color.green);
break;
case color.blue:
Console.WriteLine(color.blue);
break;
}
}
}
}
A. red
B. blue
C. 0
D. 1
E. 2
Answer: Option B
4．那個程式片段可以得到和下列程式片段一樣的結果？
int i = 0;
do
{
Console.WriteLine(i);
i+ = 1;
} while (i <= 10);
A.
int i = 0;
do
{
Console.WriteLine(i);
} until (i <= 10);
B.
int i;
for (i = 0; i <= 10 ; i++)
Console.WriteLine(i);
C.
int i = 0;
while (i <= 11)
{
Console.WriteLine(i);
i += 1;
}
D.
int i = 0;
do while ( i <= 10)
{
Console.WriteLine(i);
i += 1;
}
E.
int i = 0;
do until (i <= 10)
{
Console.WriteLine(i);
i+=1;
}
Answer: Option B
5．底下程式片段輸出為格？
int val;
for (val = -5; val <= 5; val++)
{
switch (val)
{
case 0:
Console.Write ("India");
break;
}
if (val > 0)
Console.Write ("B");
else if (val < 0)
Console.Write ("X");
}
A. XXXXXIndia
B. IndiaBBBBB
C. XXXXXIndiaBBBBB
D. BBBBBIndiaXXXXX
E. Zero
Answer: Option C
6．底下程式片段輸出為何？
char ch = Convert.ToChar ('a' | 'b' | 'c');
switch (ch)
{
case 'A':
case 'a':
Console.WriteLine ("case A | case a");
break;
case 'B':
case 'b':
Console.WriteLine ("case B | case b");
break;
case 'C':
case 'c':
case 'D':
case 'd':
Console.WriteLine ("case D | case d");
break;
}
A. case A | case a
B. case B | case b
C. case D | case d
D. Compile Error
E. No output
Answer: Option C
7．底下那個控制結構程式片段是錯的？
A.
if (Condition1)
{// Some statement}
B.
if (Condition1) {// Some statement}
else {// Some statement}
C.
if (Condition1) {// Some statement}
else {// Some statement}
else if ( Condition2){//Some statement}
D.
if ( Condition1 ) {// Some statement}
else if ( Condition2 ) {// Some statement}
else {// Some statement}
E.
if ( Condition1 ) {// Some statement}
else if ( Condition2 ) {// Some statement}
else if ( Condition3 ) {// Some statement}
else {// Some statement}
Answer: Option C
8．底下那個程式片段可以正確地決定出ODD(奇數)或EVEN(偶數)
1.
int a;
String res;
if (a % 2 == 0)
res = "Even";
else
res = "Odd";
2.
int a;
String res;
if (a Mod 2 == 0)
res = "Even";
else
res = "Odd";
3.
int a; Console.WriteLine(a Mod 2 == 0 ? "Even": "Odd");
4.
int a; Console.WriteLine(a Mod 2 == 0 ? "Even": "Odd");
A. 1, 3
B. 1 Only
C. 2, 3
D. 4 Only
E. 以上皆非
Answer: Option B
10. 那一個敘述可以用來結束一個while迴圈，並且將控制權轉移到迴圈外部？
- exit while
- continue
- exit statement
- break
- goto
A. 1, 3
B. 2, 4
C. 3, 5
D. 4, 5
E. 以上皆非
Answer: Option D
11．底下的程式片段是用來產生何種性質的數值?
int i = 1, j = 1, val;
while (i < 25)
{
Console.Write(j + " ");
val = i + j;
j = i;
i = val;
}
A. 質數 Prime
B. 費波拿契數列 Fibonacci
C. 迴文數 Palindrome
D. 奇數 Odd
E. 偶數 Even
Answer: Option B
12．底下那個敘述對下面的程式片段是正確的？
if (age > 18 && no < 11)
a = 25;
1．只在 age > 18 條件評值為True時，條件式 no < 11 將才會被評估。
2．任一條件式為真(true) a = 25才會被執行。
3．只在 age > 18 條件評值為False時，條件式 no < 11 將才會被評估。
4．二個條件式皆為True時， a = 25才會被執行。
5．&& 為眾所週知的最短路徑運算子(short circuiting logical operator)。
A. 1, 3
B. 2, 5
C. 1, 4, 5
D. 3, 4, 5
E. 以上皆非
Answer: Option C
13．底下程式片段輸出為何？
int i = 2, j = i;
if (Convert.ToBoolean((i | j & 5) & (j - 25 * 1)))
Console.WriteLine(1);
else
Console.WriteLine(0);
A. 0
B. 1
C. 編譯錯誤 Compile Error
D. 執行時期錯誤 Run time Error
Answer: Option A
14．那個程式片段可以得到和下列程式片段一樣的結果？
int a = 1, b = 2, c = 0; if (a < b) c = a;
A.
int a = 1, b = 2, c = 0; c = a < b ? a : 0;
B.
int a = 1, b = 2, c = 0; a < b ? c = a : c = 0;
C.
int a = 1, b = 2, c = 0; a < b ? c = a : c = 0 ? 0 : 0;
D.
int a = 1, b = 2, c = 0; a < b ? return (c): return (0);
E.
int a = 1, b = 2,c = 0; c = a < b : a ? 0;
Answer: Option A
15．底下程式片段輸出為何？
int i;
for(i = 0; i<=10; i++)
{
if(i == 4)
{
Console.Write(i + " "); continue;
}
else if (i != 4)
Console.Write(i + " "); else
break;
}
A. 1 2 3 4 5 6 7 8 9 10
B. 1 2 3 4
C. 0 1 2 3 4 5 6 7 8 9 10
D. 4 5 6 7 8 9 10
E. 4
Answer: Option C
15．那個迴圈片段可以正確地印出底下陣列的元素？
char[ ] arr = new chart[ ] {'k', 'i','C', 'i','t'} ;
A.
do
{
Console.WriteLine((char) i);
}
while (int i = 0; i < arr; i++);
B.
foreach (int i in arr)
{
Console.WriteLine((char) i);
}
C.
for (int i = 0; i < arr; i++)
{
Console.WriteLine((char) i);
}
D.
while (int i = 0; i < arr; i++)
{
Console.WriteLine((char) i);
}
E.
do
{
Console.WriteLine((char) i);
}
until (int i = 0; i < arr; i++);
Answer: Option B