'qt' is not a namespace or class name 这个错误怎么解决

#include
using namespace std;
//-----------------------
class Hailstone{
int n;
public:
Hailstone(int number){n=number;};
void print()
{
while(n!=1)
{
if (n%2==0){n=n/2;}
else {n=n*3+1;}
cout

大家帮我看看这个程序的问题!
#include
using namespace std;
class sxlb
{
private:
int data;
sxlb *next,*pre;
int freq;
public:
sxlb::sxlb(int f=0)
{
freq=f;
}
sxlb* build();
void shuchu(sxlb* L);
int locate(sxlb* L,int x);
};
sxlb* sxlb::build()
{
sxlb *h,*e,*p,*q;
h=new sxlb;
p=h;
int i=1;
while(1)
{
q=p;
p->next=new sxlb;
p=p->next;
p->pre=q;
coutfreq))
{
o=p2->freq;
p2->freq=p1->freq;
p1->freq=o;
t=p2->data;
p2->data=p1->data;
p1->data=t;
}
p2=p2->next;
}//为什么我调换过顺序但上面出现的i值还是不变呢
p1=p1->next;
p2=p1->next;
}
return i;
}
void main()
{
sxlb* L;
sxlb k;
L=k.build();
k.shuchu(L);
int s,i;
while(s!=-1)
{
couts;
i=k.locate(L,s);
cout

#include using namespace std; int main() { int a,b,c,d; a=c=0;b=1;d=20; if (a) d=d-10;
#include
using namespace std;
int main()
{ int a,b,c,d;
a=c=0;b=1;d=20;
if (a)
d=d-10;
else
if b)
if(!c)
d=15;
else
d=25;
cout

while 语句的用法
#include
//#include
using namespace std;
int main()
{
char ch;
int aCnt=0,eCnt=0,iCnt=0,oCnt=0,uCnt=0,
consonantCnt = 0;
while ( cin >> ch )
switch ( ch )
{
case 'a':case 'A':
++aCnt;
break;
case 'e':case 'E':
++eCnt;
break;
case 'i':case 'I':
++iCnt;
break;
case 'o':case 'O':
++oCnt;
break;
case 'u':case 'U':
++uCnt;
break;
default:
if ( isalpha( ch ))
++consonantCnt;
break;
}
cout

#include using namespace std; class blah{ public:static int a; int b; blah(int x) { b=
class blah{ public:static int a; int b; blah(int x) {
b=x; a=b+1;
}
};
int blah::a = 0; void main(void)
{ blah b1(5); blah b2(12);
cout

c c++部分语法区别
求下列C++语法对应的C语法
1.#include
2.using namespace std;
3.for(int i=0;i>xuehao>>xingming>>xibie;
8.ofstream mycout("student.txt");
for(int o=0;o

求助f(x)=x3-3x k,g(x)=(2kx-k)／(x2 2)using namespace std
Bx2^2-ax2)/(x1^2-ax1)>1 0

onepeace 1年前 已收到1个回答 举报

求助一道ACM题
一道很简单的ACM题目,题在这里
我写的代码如下：
#include
using namespace std;
int main(){
int n,m[30];
cin>>n;
for(int i=0;i=0;j--){
cout

POJ 2545
#include
using namespace std;
long min(long a,long b)
{
x05return adigit[i];
x05x05x05p[i]=1;
x05}
x05cin>>N;
x05for(i=2;i

stacktraces
there is no action mapped for namespace / and action name . - [unknown location]
com.opensymphony.xwork2.defaultaction***.prepare(defaultaction***.java:178)
org.apache.struts2.impl.strutsaction***.prepare(strutsaction***.java:61)
org.apache.struts2.impl.strutsaction***factory.createaction***(strutsaction***factory.java:39)
com.opensymphony.xwork2.defaultaction***factory.createaction***(defaultaction***factory.java:47)
org.apache.struts2.dispatcher.dispatcher.serviceaction(dispatcher.java:478)
org.apache.struts2.dispatcher.ng.executeoperations.executeaction(executeoperations.java:77)
org.apache.struts2.dispatcher.ng.filter.strutsprepareandexecutefilter.dofilter(strutsprepareandexecutefilter.java:91)
org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:235)
org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:206)
org.apache.catalina.core.standardwrappervalve.invoke(standardwrappervalve.java:233)
org.apache.catalina.core.standardcontextvalve.invoke(standardcontextvalve.java:191)
org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:128)
org.apache.catalina.valves.errorreportvalve.invoke(errorreportvalve.java:102)
org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:109)
org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:286)
org.apache.jk.server.jkcoyotehandler.invoke(jkcoyotehandler.java:190)
org.apache.jk.common.handlerrequest.invoke(handlerrequest.java:283)
org.apache.jk.common.channelsocket.invoke(channelsocket.java:767)
org.apache.jk.common.channelsocket.processconnection(channelsocket.java:697)
org.apache.jk.common.channelsocket$socketconnection.runit(channelsocket.java:889)
org.apache.tomcat.util.threads.threadpool$controlrunnable.run(threadpool.java:690)
java.lang.thread.run(thread.java:619)

--------------------------------------------------------------------------------
you are seeing this page because development mode is enabled. development mode, or devmode, enables extra debugging behaviors and reports to assist developers. to disable this mode, set:
struts.devmode=false
in your web-inf/classes/struts.properties file.

There is no Action mapped for namespace /study and action name viewsubthemead?id=.
怎么修理

#include
#include
#include
#include
using namespace std;
const int MAXN = 9;
int N;
string s[MAXN];
int id[MAXN];
bool cmp(int i,int j) { // 比较函数
return s[i] + s[j] < s[j] + s[i];
}
void input() { // 输入函数
int i;
char str[109];
scanf("%d",&N); // 读入字符串数目,C style,也可以直接cin>>N;
for (i = 0; i < N; i++) {
scanf("%s",str); // 读入字符串,C style,也可以直接cin>>s[i];
s[i] = str;
id[i] = i; // 标记字符串下标,用于排序
}
}
void solve() {
int i;
sort(id,id + N,cmp); // 基于下标的排序,字符串本身不被修改
for (i = 0; i < N; i++)
printf("%s",s[id[i]].c_str()); // 输出结果,C style,也可以直接cout

这个程序错误在哪里?
#include
using namespace std;
class Date{
public:
void setDate(int y,int m,int d);
void showDate();
private:
int year;
int month;
int year;
};
void Date::setDate(int y,int m,int d)
{
year=y;
month=m;
day=d;
}
void Date::showDate()
{cout

c++代码,
#include
using namespace std;
//声明
class Point;
Point operator+(Point &a,Point &b);
//定义点类
class Point
{
public:
int x,y;
Point(){}
Point(int xx,int yy){x=xx;y=yy;}
void print(){ cout

#include using namespace std; class A{ public:A *next; int date; A*f(A*head,int i); } ;

#include using namespace std; int main() { int a,b,c; a=3; int f(int x,int y,int z);
#include
using namespace std;
int main()
{
int a,b,c;
a=3;
int f(int x,int y,int z);
cin>>a>>b>>c;
c=f(a,b,c);
cout

#include using namespace std; int main() {char c1='a',c2='b',c3='c',c4='101',c5='116';
#include
using namespace std;
int main()
{char c1='a',c2='b',c3='c',c4='101',c5='116';
cout

我编译后出现4个错误
#include
using namespace std;
enum CPU_Ran{P1=1,P2,P3,P4,P5,P6,P7};
class CPU{
public:
x05CPU(int x,CPU_Ran y,double z);
x05~CPU(){
x05x05cout

C++10*10矩阵相乘
#include
#include
using namespace std;
int main()
{
int A[100],B[100],C[100];
int i,j,k;
ifstream inA("C:Program FilesMicrosoft Visual StudioMyProjects实验3A");
if(!inA){
cout

X=xx,
#include
#include
using namespace std;
class point
{
public:
point(int xx=0,int yy=0) {X=xx;Y=yy;}
int getX() {return X;}
int getY() {return Y;}
friend float fdist(point &a,point &b);
private:
int X,Y;};
float fdist(point &p1,point &p2)
{double x=double(p1.X-p2.X);
double y=double(p1.Y-p2.Y);
return float (sqrt(x*x+y*y));
}
void main(){point myp1(1,1),myp2(4,5);
cout

求问一个小小的c++的问题,
#include
#include
#include
using namespace std;
int main()
{
vector lines;
string s = "abcnbnncn***ef";
string::size_type pos1 = 0;
string::size_type pos2 = 0;
if(s.find('n') = string::npos)
{
while( (pos2 = s.find_first_of('n',pos1)) = string::npos)
{
if(pos1 == pos2)
lines.push_back("n");
else
{
lines.push_back(s.substr(pos1,pos2));
lines.push_back("n");
}
++pos2;
pos1 = pos2;
}
lines.push_back(s.substr(pos1,pos2));
}
vector::iterator it;
for(it = lines.begin();it = lines.end();++it)
{
cout

各位帮忙找一下错误,改正一下.
#include
using namespace std;
//类的定义
class People{
public:
People(int Num, char Sex, int Bir, int Id);
int GetNum();
char GetSex();
int GetBir();
int GetId();
~People(){};
private:
int num;
char sex[10];
int bir;
int id;
};
//成员函数的具体实现
inline People::GetNum (){
cout

#include
#include
#include
#include
usingnamespace std;
intf[105][500],tmp[500];
intmid,l,r;
constint inf=1000000;
structnode
{
intv,c,next;
}edge[300];
intg[105];
inttt=0,n;
intaddedge(int a,int b,int c)
{
edge[++tt].v=b;
edge[tt].c=c;
edge[tt].next=g[a];
g[a]=tt;
return0;
}
intupdata(int &a,int b)
{
if(b>a)
a=b;
return0;
}
intcheck(int a)
{
if(a>=-mid&&a

这个程序哪里错了啊?
#include
#include
using namespace std;
int main()
{
int A,B,C,D,E,F;
for(A=0;A

如何理解此方法求质数?
#include
#include
using namespace std;
int main()
{
int i,j,k,flag;
for(i=2;i

#include
#include
#include
using namespace std;
struct node
{
friend bool operator< (node n1,node n2)
{
return n2.cost < n1.cost;
}
int index,cap,cost;
};
priority_queue q;
bool mark[1001][101];
int p[1001];
int map[1001][1001];
vector list[1001];
int main()
{
//freopen("debug \in.txt","r",stdin);
int i,j,x,y,num,total,repeat,m,n;
node s,t;
cin>>m>>n;
for(i=0;i

串行算法改成并行算法
#include
#include
using namespace std;
//设置全局数组——牛顿 科特斯公式系数表
double C[6][7]={{1.0/2,1.0/2},{1.0/6,4.0/6,1.0/6},{1.0/8,3.0/8,3.0/8,1.0/8},
{7.0/90,16.0/45,2.0/15,16.0/45,7.0/90},
{19.0/288,25.0/96,25.0/144,25.0/144,25.0/96,19.0/188},
{41.0/840,9.0/35,9.0/280,34.0/105,9.0/280,9.0/35,41.0/840}};
int main()
{
double a=0.0,b=0.0,Cotes=0.0;
int n=0;
coutb;
cout