《C#考试题》代码阅读题.docx
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《C#考试题》代码阅读题.docx
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《C#考试题》代码阅读题
《C#应用开发》——代码阅读题
1.阅读下面的程序,并写出执行的结果。
(10分)
usingSystem;
interfaceInter1
{
voidF();
}
publicclassA:
Inter1
{
publicvirtualvoidF()
{
Console.WriteLine("A.F");
}
}
publicclassB:
A
{
publicoverridevoidF()
{
Console.WriteLine("B.F");
}
}
publicclassC:
B,Inter1
{
newpublicvirtualvoidF()
{
Console.WriteLine("C.F");
}
}
publicclassD:
C,Inter1
{
publicoverridevoidF()
{
Console.WriteLine("D.F");
}
voidInter1.F()
{
Console.WriteLine("D.FwithInter1");
}
}
publicclassE:
D
{
publicoverridevoidF()
{
Console.WriteLine("E.F");
}
}
publicclassApp
{
staticvoidM(Aa)
{
Inter1i=(Inter1)a;
i.F();
}
staticvoidMain()
{
Aa1=newE();
Bb1=newE();
Cc1=newE();
Dd1=newE();
Ee1=newE();
a1.F();
b1.F();
c1.F();
d1.F();
e1.F();
Aa2=newA();
Ab2=newB();
Ac2=newC();
Ad2=newD();
Ae2=newE();
M(a2);
M(b2);
M(c2);
M(d2);
M(e2);
}
}
2.阅读以下程序,试分别描述程序执行至①,②,③处时,变量s1,s2,c1,c2,c3在堆栈和托管堆中的情况,并说明原因。
(10分)
usingSystem;
publicdelegatevoidD1(PointStructmystruct);
publicdelegatevoidD2(PointClassmyclass);
publicdelegatevoidD3(refPointStructmystruct);
publicstructPointStruct
{
publicintx;
publicinty;
publicPointStruct(intx,inty)
{
this.x=x;
this.y=y;
}
}
publicclassPointClass
{
publicintx;
publicinty;
publicPointClass(intx,inty)
{
this.x=x;
this.y=y;
}
}
classmyclass
{
publicstaticvoidSetClass(PointClassp)
{
if(p.x==0)
p.x=100;
if(p.x==100)
p.y+=100;
}
publicstaticvoidSetStruct(PointStructp)
{
if(p.x==0)
p.x=100;
if(p.x==100)
p.y+=100;
}
publicstaticvoidSetStruct(refPointStructp)
{
if(p.x==0)
p.x=100;
if(p.x==100)
p.y+=100;
}
staticvoidMain()
{
PointStructs1=newPointStruct(0,0);
PointClassc1=newPointClass(0,0);
PointStructs2=s1;
PointClassc2=c1;
PointClassc3=newPointClass(100,100);
//------------------------------------------①
SetClass(c1);
SetStruct(s1);
SetStruct(refs2);
//------------------------------------------②
D1d1=newD1(SetStruct);
D2d2=newD2(SetClass);
D3d3=newD3(SetStruct);
d1+=d1;
d2+=d2;
d3+=d3;
d1(s2);
d2(c2);
d2(c3);
d3(refs1);
//------------------------------------------③
Console.WriteLine("theend");
}
}
《C#应用开发》——写出运行结果
1.usingSystem;
classMyTest
{
publicvoidswap(refintx,refinty)
{
inttemp=x;
x=y;
y=temp;
}
}
classtest
{
staticvoidMain()
{
inta=6,b=8;
MyTestapp=newMyTest();
app.swap(refa,refb);
Console.WriteLine(“a={0}b={1}”,a,b);
}
}
2.usingSystem;
classTest{
staticvoidMain()
{
for(inti=0;i<10;i++)
{
Console.Write(i+“”);
if(i%2!
=0)
Console.WriteLine();
}
}
}
1.usingSystem;
classTest{
publicvoidF(strings)
{
for(inti=0;i Console.Write(s[i]); return; } publicstaticvoidMain() { stringstr=“syd168编写及收集整理”; Testt=newTest(); t.F(str);}} 2.usingSystem; classDemo{ inta; publicA(intn) { a=n; } publicintM() { if(a>0) returna--; elsereturn0; } } classTest{ staticvoidMain() { Demox=newDemo(9 ); intk=x.M(); while(k>0) { Console.Write(“{0}\t”,k*k); j=x.M(); } } } 1.usingSystem; classStringDe { publicvoidf(strings) { for(intj=0;j Console.Write(s[j]); return; } publicstaticvoidMain() { stringstr1=“ABCDEFGH”; StringDeob=newStringDe(); ob.f(str1); } } 3.usingSystem; classCounterDown{ intval; publicCounterDown(intn) {val=n;} publicintcount() { if(val<6) returnval++; elsereturn0; } } classNSDemo {publicstaticvoidMain() { CounterDowncd1=newCounterDown (2); inti=cd1.count(); while(i>0) { Console.Write(i*3+“”); i=cd1.count(); } } } 1.usingSystem; classDemo2 { staticvoidMain() { intk=1,m; while(k<=10) { m=k*k; Console.Write("{0}\t",m); k++; } } } 2.usingSystem; classARRAY { publicstaticvoidMain() { intoddsum=0; intevensum=0; int[]arr={1,5,2,3,6,7,12,15}; foreach(intkinarr) { if(k%2==0) evensum+=k; else oddsum+=k; } Console.WriteLine(“evensum={0}”,evensum); Console.WriteLine(“oddsum={0}”,oddsum); } staticvoidMain() { ARRAYa=newARRAY(); a.Fun(); }} 1. usingSystem;classexception{ staticvoidMain() { for(inti=0;i<2;i++) { Console.WriteLine("i="+i); try{ switch(i) { case0: intt=10/i; break; case1: thrownewException("人为抛出异常"); break; } } catch(DivideByZeroExceptione) { Console.WriteLine(e.Message); } catch(Exceptione) { Console.WriteLine(e.Message); } finally { Console.WriteLine("Leavingtry."); } } } } 2.usingSystem; classA { intx; publicA(inti) { x=n; } publicintF() { if(x>0) returnx--; elsereturn0; } } classTest{ staticvoidMain() { Aa=newA(9); intj=a.F(); while(j>0) { Console.Write(“{0}\t”,j*j); j=a.F(); } } } 1. usingSystem; classTest{ staticvoidMain() { inti,j,k; for(i=1;i<=4;i++) { for(j=1;j<=4-i;j++) Console.Write(""); for(k=1;k<=2*i-1;k++) Console.Write("*"); Console.WriteLine(); } } } 2.usingSystem; classCounterDown{ intval; publicCounterDown(intn) { val=n; } publicintcount() { if(val<9) returnval++; elsereturn0; } } classNSDemo{ publicstaticvoidMain() { Counter.CounterDowncd1=newCounter.CounterDown (2); inti=cd1.count(); while(i>0) { Console.Write(i+“”); i=cd1.count(); } } } 1.usingSystem; classStringDe { publicvoidf(strings) { for(intj=0;j Console.Write(s[j]); return; } publicstaticvoidMain() { stringstr1=“中华人民共和国于一九四九年建立”; StringDeob=newStringDe(); ob.f(str1); } } 2.usingSystem; delegatevoidMyEventHandler(); classMyEvent{ publiceventMyEventHandleractivate; publicvoidfire() { if(activate! =null) activate(); } } classX{ intid; publicX(intx) { id=x/2; } publicvoidXhandler() { Console.WriteLine(id); } } classEventDemo{ staticvoidMain() { MyEventevt=newMyEvent(); Xx1=newX(8); Xx2=newX(16); Xx3=newX(0); evt.activate+=newMyEventHandler(x1.Xhandler); evt.activate+=newMyEventHandler(x2.Xhandler); evt.activate+=newMyEventHandler(x3.Xhandler); evt.fire(); } } 1.usingSystem;classexception{ staticvoidMain() { for(inti=0;i<2;i++) { Console.WriteLine("i="+i); try{ switch(i) { case0: intt=10/i; break; case1: thrownewException("人为抛出异常"); break; } } catch(DivideByZeroExceptione) { Console.WriteLine(e.Message); } catch(Exceptione) { Console.WriteLine(e.Message); } finally { Console.WriteLine("Leavingtry."); } } } } 2.usingSystem; classA { intx; publicA(inti) { x=n; } publicintF() { if(x>0) returnx--; elsereturn0; } } classTest{ staticvoidMain() { Aa=newA(9); intj=a.F(); while(j>0) { Console.Write(“{0}\t”,j*j); j=a.F(); } } } 1. usingSystem; classStringDe { publicvoidf(strings) { for(intj=0;j Console.Write(s[j]); return; } publicstaticvoidMain() { stringstr1=“中华人民共和国于一九四九年建立”; StringDeob=newStringDe(); ob.f(str1); } } 2.usingSystem; delegatevoidMyEventHandler(); classMyEvent{ publiceventMyEventHandleractivate; publicvoidfire() { if(activate! =null) activate(); } } classX{ intid; publicX(intx) { id=x/2; } publicvoidXhandler() { Console.WriteLine(id); } } classEventDemo{ staticvoidMain() { MyEventevt=newMyEvent(); Xx1=newX(8); Xx2=newX(16); Xx3=newX(0); evt.activate+=newMyEventHandler(x1.Xhandler); evt.activate+=newMyEventHandler(x2.Xhandler); evt.activate+=newMyEventHandler(x3.Xhandler); evt.fire(); } } 1. usingSystem; classTest { staticvoidF() { x=1; while(x<=20) { Console.Write(x); if(x%5==0) Console.WriteLine(); else Console.Write(“\t”); } staticvoidMain() { F(); } } 2. usingSystem; classSumw { staticvoidMain() { intx=0,y=0; do { x=x+1; if(x%2! =0) continue; y=y+1; } while(x<=10); Console.WriteLine(“y={0}”,y); } }
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