单项选择题

以下程序的输出结果是
#include ＜iostream.h＞
void main()

int a=0,i;
for(i=1 ;i＜5;i++)

switch(i)

case 0:
case 3: a+=2;
case 1:
case 2: a+=3;
default: a+=5;

cout＜＜a＜＜end1;
return;

A．31
B．13
C．10
D．20

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单项选择题

有以下程序 #include ＜iostream＞ #include ＜string＞ using namespace std; class base private: char baseName[10]; public: base() strcpy(baseName, Base ); virtual char *myName() return baseName; char *className() Return baseName; ; class Derived: public base private: char derivedName[10]; public: Derived() strcpy(derivedName, Derived ); char *myName() return derivedName; char *className() return derivedName; ; void showPtr(base &p) cout＜＜p.myName()＜＜＜＜p.className(); int main() base bb; Derived dd; showPtr(dd); return 0; 运行后的输出结果为

A．Derived Base
B．Base Base
C．Derived Derived
D．Base Derived

单项选择题

以下程序段共有错误( )处 #include ＜iostream＞ using namespaces std; class Sample private: int n; public: Sample(int i) n=i; void setvalue(int i) n=i; void display() cout＜＜ n= ＜＜n＜＜end1; ; int main() const Sample a(l0); a.setvalue(5); a.display(); return 0;

A．1
B．2
C．3
D．4

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