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      1. C語言開發(fā)工程師選擇題

        時(shí)間:2020-11-23 10:00:11 筆試題目 我要投稿

        C語言開發(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”;

          break;

          case 2:

          position = “兄弟”;

          break;

          }

          Console.WriteLine(position);

          }

          a) 兄長

          b) 兄弟

          c) 小妹

          d) 兄長兄弟

          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 沒有寫B(tài)reak!!!!

          b) 輸出149

          c) 輸出123246369

          d) 正確運(yùn)行,但沒有輸出

          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)類似于關(guān)系數(shù)據(jù)庫的結(jié)構(gòu),并在與數(shù)據(jù)庫斷開的情況下,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,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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