C語(yǔ)言開(kāi)發(fā)工程師選擇題
1.分析如下所示C#代碼，編譯運(yùn)行后的輸出結(jié)果是( )。(選擇一項(xiàng))
public static void Main(string[] args)
{
int param = 2;
string position = “”;
switch (param)
{
case 1:
position = “兄長(zhǎng)”;
break;
case 2:
position = “兄弟”;
break;
}
Console.WriteLine(position);
}
a) 兄長(zhǎng)
b) 兄弟
c) 小妹
d) 兄長(zhǎng)兄弟
2.現(xiàn)有如下一段C#代碼，該代碼的運(yùn)行結(jié)果是( )。(選擇一項(xiàng))
public static void Main(){
for (int i=1;i<=3;i++){
switch(i){
case 1:
Console.Write(i.ToString());
break;
default:
Console.Write((i*3).ToString());
}
}
}
a) 169
b) 有編譯錯(cuò)誤 沒(méi)有break!!!
c) 369
d) 123
3.看以下一段程序：
Console.Write("hello world !");
Console.WriteLine("friend.");
int i=0;
do
{
Console.Write("thank you !");
i++;
}while(i<2);
程序的輸出結(jié)果是( )(選擇一項(xiàng))
a) hello world ! friend thank you !thank you !
b) hello world ! friend
thank you !thank you! Writeline 代表能換行
c) hello world ! friend. thank you ! thank you !
d) hello world !
friend. thank you !
4. using System;
class Test{
static void Main(String [] args){
int a=10,b=20，c=30;
if(a>b||b>c)
Console.WriteLine(a);
else if(a
Console.WriteLine(b+c);
else
Console.WriteLine(c);
}
}
a) 10
b) 20
c) 50
d) 60
5. 以下C#程序：
static void Main(string[] args)
{
int val = 1;
for (int i=3;i<10;i+=2)
{
Console.WriteLine(i);
}
}
運(yùn)行時(shí)將輸出( )。(選擇一項(xiàng))
a) 3
5
7
9
b) 5
7
9
c) 5
7
9
11
d) 9
6. 分析下面的代碼片段，正確的輸出結(jié)果是( )。(選擇一項(xiàng))
int i=0;
for(;i<4;i+=2){
Console.Write(i+”,”);
}
Console.Write (i);
a) 0,2
b) 0,2,4
c) 0,2,4,6
d) 0,1,2,3
7. 給定如下C#代碼片段，編譯運(yùn)行結(jié)果是( )。(選擇一項(xiàng))
int i = 0, j = -1;
switch (i){
case 0,1: j=1;
case 2: j=2;
}
Console.Write (“j=”+j);
a) 程序編譯出錯(cuò)
b) 輸出：j=1
c) 輸出：j=2
d) 輸出：j=0
8. 在C#中，下列代碼的.運(yùn)行結(jié)果是( )。(選擇一項(xiàng))
using System;
class Test{
static void Main(string[] args){
int a=21,b=22,c=23;
if (a>b‖b>c)
Console.WriteLine(++b);
else
Console.WriteLine(a+b+c);
}
}
a) 22
b) 23
c) 66
d) 編譯出錯(cuò)
9. 以下關(guān)于C#代碼的說(shuō)法正確的是( )。(選擇一項(xiàng))
for(int i=1;i<=3;i++)
{
switch(i)
{
case 1:
Console.Write(i.ToString();
case 2:
Console.Write((i*2).ToString();
case 3:
Console.Write((i*3).ToString()
}
}
a) 有編譯錯(cuò)誤，提示case標(biāo)簽不能貫穿到另一個(gè)標(biāo)簽，不能運(yùn)行 沒(méi)有寫(xiě)B(tài)reak!!!!
b) 輸出149
c) 輸出123246369
d) 正確運(yùn)行，但沒(méi)有輸出
10. 針對(duì)以下的C#代碼:
using System;
class A
{
static void Main()
{
int[] B = new int[10];
for(int I=1;I<=10;I++)
{
//空白處
}
foreach (int C in B)
{
Console.WriteLine (C);
}
}
}
要在控制臺(tái)輸出1到10的數(shù)字，空白處應(yīng)填寫(xiě)的正確的代碼為( )。(選擇一項(xiàng))
a) B[I]=I+1;
b) B[I]=I;
c) B[I-1]=I;
d) B[I+1]=I;
11.在C#中，下列代碼的運(yùn)行結(jié)果是( )(選擇一項(xiàng))
int a=30,b=20;
b=a;
a=10;
Conlose.WriteLine(a);
Conlose.WriteLine(b);
a) 10
10
b) 10
30
c) 30
20
d) 10
20
12.下列語(yǔ)句執(zhí)行后，變量i的值為多少?( )(選擇一項(xiàng))
string str = @”"”Ahoy”",cried the caption. “;
string str2 = “\”Ahoy\”,cried the caption. “;
int I = string.Compare(str,str2);
a) false
b) -1
c) 1
d) 0
13.在VS.Net開(kāi)發(fā)環(huán)境中，為程序代碼增加斷點(diǎn)，快捷鍵為( )。(選擇一項(xiàng))
a) F2
b) F5
c) F8
d) F9
14.在ADO.NET中，( )對(duì)象的結(jié)構(gòu)類(lèi)似于關(guān)系數(shù)據(jù)庫(kù)的結(jié)構(gòu)，并在與數(shù)據(jù)庫(kù)斷開(kāi)的情況下，在緩存中存儲(chǔ)數(shù)據(jù)。(選擇一項(xiàng))
a) DataAdapter 加載數(shù)據(jù)源
b) DataSet 重載
c) DataTable
d) DataReader 讀取機(jī)制
15. 下面關(guān)于數(shù)據(jù)庫(kù)操作的代碼，錯(cuò)誤的是( )(選擇兩項(xiàng))
a) SqlConnection conn = new SqlConnection();
SqlCommand comm = new SqlCommand();
comm.ExecuteNonQuery();
b) SqlConnection conn = new SqlConnection(“server=.;uid=sa;pwd=sa;database=db1”);
conn.Open();
SqlCommand comm = new SqlCommand(“delete * from table1”, conn);
comm.ExecuteNonQuery();
conn.Close()
c) SqlConnection conn = new SqlConnection(“server=.,uid=sa,pwd=sa,database=db1”);
conn.Open();
SqlCommand comm = new SqlCommand(“delete * from table1”);
comm.ExecuteNonQuery();
conn.Close();
d) SqlConnection conn = new SqlConnection(“server=.;uid=sa;pwd=sa;database=db1”);
conn.Open();
SqlCommand comm = new SqlCommand(“delete * from table1”, conn);
comm.ExecuteNonQuery();
16.運(yùn)行下面一段代碼：
class Class1
{
public static int count = 0;
static Class1()
{
count++;
}
public Class1()
{
count++;
}
}
Class1 o1 = new Class1();
Class1 o2 = new Class1();
請(qǐng)問(wèn)，o1.count的值是多少?( )(選擇一項(xiàng))
a) 1
b) 2
c) 3
d) 4
17.在C#中，下列代碼的運(yùn)行結(jié)果是( )。(選擇一項(xiàng))
class A{
public void printStr(string str){
Console.WriteLine(str);
}
}
class B:A{
new public void printStr(string str){
str=str+”(override)”;
Console.WriteLine(str);
}
public static void Mail(string[] args){
A a=new A();
B b=new B();
a.printStr(“test”);
b.printStr(“test”);
}
}
a) test
test(override)
b) test(override)
c) test
d) test(override)
test(override)
18.分析以下C#代碼，根據(jù)面向?qū)ο蟮亩鄳B(tài)性，代碼的運(yùn)行結(jié)果是( )。(選擇一項(xiàng))
class A{
public void F(){
Console.Write(“A”);
}
方法重載
public void F(string chr){
Console.Write(chr);
}
}
class B:A{
public void F(){
Console.Write(“B”);
}
}
public class Test{
public static void Main(string[] args){
A a = new B();
a.F();
}
}
a) B
b) A
c) AB
d) BA
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