[Error] cannot call member function ‘‘ without object

今天遇到一个错误
[Error] cannot call member function ‘int Computer::getCnt()’ without object
意思是不能在没有对象的情况下，调用Computer类的成员函数getCnt();

原代码

#include<iostream>
#include<cstring> using namespace std;class Computer{public:char *name;static int cnt;Computer(char *n){//使用strcpy将n复制到name中int l=strlen(n);name=new char[l+1];    strcpy(name,n);cnt++;}Computer(const Computer&p)//拷贝构造函数{int l=strlen(p.name);name=new char[l+1];  strcpy(name,p.name);cnt++;} ~Computer(){delete []name;cnt--;} Computer setName(char* nn){int l=strlen(nn);name=new char[l+1];strcpy(name,nn);return *this;//return this返回自身对象的指针 //return *this返回的是当前对象的克隆或者本身（若返回类型为A， 则是克隆， 若返回类型为A&， 则是本身 ）}void print(){int ll=strlen(name);for(int i=0;i<ll;i++){cout<<name[i];}cout<<endl;
//      cout<<name<<endl;}int getCnt(){return cnt;}
};int Computer::cnt=0;
int main()
{char str[101];cout<<"1:"<<Computer::getCnt()<<" computers."<<endl;   Computer com1("Tom"), com2(com1);cout<<"2:"<<com2.getCnt()<<" computer."<<endl;cin>>str;com2.setName(str).print();com2.print();cout<<"3:"<<com2.getCnt()<<" computer."<<endl;return 0;
}

这里在代码第60行其实是想输出static变量sum的初始值，需要调用静态函数输出，否则出现上述错误

修改后代码

#include<iostream>
#include<cstring> using namespace std;class Computer{public:char *name;static int cnt;Computer(char *n){//使用strcpy将n复制到name中int l=strlen(n);name=new char[l+1];    strcpy(name,n);cnt++;}Computer(const Computer&p)//拷贝构造函数{int l=strlen(p.name);name=new char[l+1];  strcpy(name,p.name);cnt++;} ~Computer(){delete []name;cnt--;} Computer setName(char* nn){int l=strlen(nn);name=new char[l+1];strcpy(name,nn);return *this;//return this返回自身对象的指针 //return *this返回的是当前对象的克隆或者本身（若返回类型为A， 则是克隆， 若返回类型为A&， 则是本身 ）}void print(){int ll=strlen(name);for(int i=0;i<ll;i++){cout<<name[i];}cout<<endl;
//      cout<<name<<endl;}static int getCnt(){return cnt;}
};int Computer::cnt=0;
int main()
{char str[101];cout<<"1:"<<Computer::getCnt()<<" computers."<<endl;//[Error] cannot call member function 'int Computer::getCnt()' without object//不能在没有对象的情况下，调用Computer类的成员函数getCnt();//修改：将getCnt()声明为静态函数 Computer com1("Tom"), com2(com1);cout<<"2:"<<com2.getCnt()<<" computer."<<endl;cin>>str;com2.setName(str).print();com2.print();cout<<"3:"<<com2.getCnt()<<" computer."<<endl;return 0;
}

其实直接将使用静态变量的函数定义为静态函数，就可以避免出现此类错误

参考
1.关于错误信息：cannot call member function ’ ’ without object
2.Error:cannot call member function without object

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