已知ls=[12,34.5,True,'test',3+5j],则下列选项中,输出结果为“['test']”的选项是()。A.ls[3]B.ls[4]C.ls[3:4]D.ls[4:5]
已知ls=[12,34.5,True,'test',3+5j],则下列选项中,输出结果为“['test']”的选项是()。
A.ls[3]
B.ls[4]
C.ls[3:4]
D.ls[4:5]
参考答案和解析
round(lst)
相关考题:
已知在D\Python目录下有一个test.dat文件,则下列选项中返回True的是。() A、os.path.isfileD\\Python\\test.datB、os.path.isdirD\\PythonC、os.path.existsD\\PythonD、os.path.existsD\\Python\\test.dat
下列程序的输出结果为012,请根据注释将横线处的缺失部分补充完整。 include using name 下列程序的输出结果为012,请根据注释将横线处的缺失部分补充完整。include<iostream>using namespace std;class Test{public:Test(int A) {data=a;}~Test(){}void print(){cout<<data;)private:int data;};int main(){Test t[3]={______};//对有3个元素的Test类对象数组t初始化for(int i=0; i<3; i++) t[i]. print();return 0;}
若下面程序运行时输出结果为1, A, 10.12, B, 3.5请将程序补充完整 。#includeusing namespace std;int main(){void test(int, char,double 【 8 】 );test(1,'A',10.1);test(2,'B');return 0;}void test(int a, char b, doubleC .{cout}
已知程序中已经定义了函数test,其原型是int test(int,int,int);,则下列重载形式中正确的是A.char test (int,int,int);B.double test(int,int,double);C.int test(int,int,int=O);D.float test(int,int,float=3.5F);
( 27 )有如下程序:#includeusing namespace std;class test {private:int a;public:test () {cout ” constructor ” ENDL;}test ( int a ) {coutAENDL;}test ( const test & _test ){a=_testa;cout ” copy constructor ” ENDL;}test () {cout ” destructor ” ENDL;}};int main ()}test A ( 3 )return0;运行时输出的结果是A ) 3B ) constructordestruclorC ) copy constructordstructorD ) 3destruclor
下列程序段的输出结果是【 】。public class Test {void printValue(int m) {do {System.out.println("The value is"+m);}while (--m>10);}public static void main (String args[]) {int i=10;Test t= new Test();t.printValue(i);}}
已知函数tEst定义为:voiDtEst() { ………… }则函数定义中voiD的含义是()A、执行函数tEst后,函数没有返回值B、执行函数tEst后,函数不再返回C、执行函数tEst后,函数返回任意类型值D、以上三个答案都是错误的
( 28 )有如下程序#include iostreamusing namespace std;class Test{public:Test(){ }Test(const Test t) {cout1;}};Test fun(Test u) {Test t=u; return t;}int main(){Test x,y; x=fun(y); return 0;}运行这个程序的输出结果是A )无输出B ) 1C ) 11D ) 111
有如下程序:includeusing namespace std;class test{private: int a;public: test( 有如下程序:#include<iostream>using namespace std;class test{private: int a;public: test(){cout<<"constructor"<<endl;} test(int a){cout<<a<<endl;} test(const test_test) { a=_test.a; cout<<"copy constructor"<<en+dl; } ~test(){cout<<"destructor"<<endl;}};int main(){ test A(3); rerun 0;}运行时输出的结果是A.3B.constructor destructorC.copy constructor destructorD.3 destructor
有如下程序: #include using namespace std; Class Test{ public: Test(){} Test(const Testt){cout1;} ); Test fun(Test u){Test t=u;retum t;} int main(){Test X,y;x=fun(y);retum 0;} 运行这个程序的输出结果是( )。A.无输出B.1C.11D.111
根据输出结果填空完成下面程序。 include class Test { private: static int val; in 根据输出结果填空完成下面程序。include<iostream.h>class Test{private:static int val;int a;public:static int func( );void sfunc(Test r);};______//初始化静态变量valint Test::func( ){return val++;}void Test::sfunc(Test r){r.a=125;cout<<"Result3="<<r.a;}void main( ){cout<<"Resultl="<<Test::func( )<<endl;Test A;cout<<"Result2="<<A.fune( )<<endl;A. sfunc(A);}输出结果为:Result1=201Result2=202Result3=125
若下面程序运行时输出结果为1,A,10.1 2,B,3.5 include using namespace std; int mai 若下面程序运行时输出结果为1,A,10.12,B,3.5include <iostream>using namespace std;int main(){void test(int, char, doubie【 】);test(1, 'A', 10.1 );test(2, 'B');return 0;}void test(int a, char b, double c){cout<<a<<','<<b<<','<<c<<endl;}
下列程序的执行结果是 ( ) public class Test { public int aMethod() { satic int i=0; i++; System.out.println(i); } public static void.main(String args[]) { Test test=new Test(); test.aMethod(); }A.编译错误B.0C.1D.运行成功,但不输出
下列程序的运行结果是【 】。 include class test { private: int num; public: tes 下列程序的运行结果是【 】。include <iostream. h>class test{private:int num;public:test()int TEST() {return num+100;}~test()};test::test(){num=0;}test::~test(){cout<<"Destructor is active"<<endl;}void main(){test x[3]cout<<x[1]. TEST()<<endl;}
已知有下列类的说明,则下列哪个语句是正确的?public class Test { private float f=1.0f; int m=12; static int n=1; public static void main(String arg[]) { Test t= new Test(); }}A.t.f;B.this. nC.Test.m;D.Test.f;
已知有下列类的说明,则下列( )语句是正确的。 publicClass Test{ private float f=1.0f; int m=12; static int n=1: public static void main(Stringarg[]){ Test t=new Test(): } }A.t.f;B.this.n;C.Test.m;D.Test.f;
如下程序的输出结果是includeusing namespace std;class Test{public:Test( ){n+=2;} 如下程序的输出结果是 #include<iostream> using namespace std; class Test{ public: Test( ){n+=2;} ~Test( ){n-=3;} static int getNum( ){return n;} private: static int n; }; int Test::n=1; int main( ){ Test*P=new Test: delete P; cout<<"n="<<Test::getNum( )<<endl; return 0; }A.n=0B.n=1C.n=2D. n=3
下列语句输出结果为( )。 public class test { public static void main (String args[]) { int x=10,y=9; boolean b=true; System.out.println(x<y||!b); } }A.真B.假C.1D.0
若下列程序运行时输出结果为 1,A,10.1 2,B,3.5 请将程序补充完整。 include using name 若下列程序运行时输出结果为1,A,10.12,B,3.5请将程序补充完整。include<iostream>using namespace std;int main(){void test(int,char,double______);test(1,'A',10.1);test(2,'B');return 0;}void test(int a,char b,double c){cout<<a<<','<<b<<','<<c<<end1;}
下列程序的输出结果是( )。 include include"string.h" void main() {char a[]="He 下列程序的输出结果是( )。 #include<iostream.h> #include"string.h" void main() {char a[]="Hello Test",b[]="Test"; strcpy(a,b); cout<<a<<end1; }A.HelloB.TestC.Hello TestD.Hello Test HelloTest
有如下程序: #inCludeiostream using namespaCe std; Class test{ private: int a; publiC: test( ){Cout”ConstruCtor”endl;} test(int A.{Coutaendl;} test(Const test_test){ a=test.a: Cout”Copy ConstruCtor”endl: } test( ){Cout”destruCtor”endl;} }; int main( ){ test A(3); return 0; } 执行这个程序的输出结果是( )。A.3B.ConstruCtor destruCtorC.Copy ConstruCtor destruCtorD.3 destruCtor
下列选项中,哪个是程序的运行结果class Test{public static void main(String[] args) {int a = 3;int b = 6;System.out.print(a==b);System.out.print(aSystem.out.print(a!=b);System.out.print(a>=b);}} A.false false true falseB.false false true trueC.false true true falseD.true false false true
下列程序的输出结果是______。 include using namespace std; class Test( public: Te 下列程序的输出结果是______。 #include<iostream> using namespace std; class Test( public: Test() {cnt++;} ~Test() {cnt--;} static int Count(){return cnt;} private: static int cnt; }; int Test::cnt=0; int main() { cout<<Test::Count()<<""; Test t1,t2; Test*pT3=new Test; Test*pT4=new Test; cout<<Test::Count()<<""; delete pT4; delete pT3; cout<<Test::Count()<<end1; return 0; }A.024B.042C.420D.240
在下列源代码文件Test.java中,哪个选项是正确的类定义? ( )A.public class test { public int x=0; public test(int x) { this.x=x; } }B.public class Test { public int x=0; public Test(int x) { this.x=x; } }C.public class Test extends Ti,T2 { public int x=0; public Test(int x) { this.x=x; } }D.protected class Test extends T2 { public int x=0; public Test(int x) { this.x=x; } }
下列程序的输出结果是 ( ) class Derao { void test() { Systeme.out.print("NO");} void test (int i) {System.out.print(a);} void test(int a,int b) {System.out.print(a+b);} } class Test { public static void main(String args[]) { Demo de=new Demo(); de.test(); de.test5.; de.test(6,8); } }A.No568B.568NoC.No514D.86No5
有两张表TEST1,TEST2,现在要将TEST1的部分内容复制到TEST2中,选出下列选项中有效的复制方法()A、使用INSERT语句逐条插入到TEST2中B、打开表TEST2逐条手动输入数据C、使用INSERTSELECT方式插入到TEST2中D、直接复制粘贴数据到表TEST2