请帮小弟分析下是什么错误。谢谢
#include<iostream.h>classaddition{ (intnum);addition*next;};voidsum(intnum1,intnum2){cout<<"theansis:"<<num1+num2<<endl;}voidnumber(addition*&a,intnum){addition*p=newaddition(num);p->next=NULL;if(a==NULL)a=p;else{a->next=p;a=a->next;}}voidmain(){intnum1,num2;addition*a=NULL;cout<<"inputtwodigitsforaddition"<<endl;cin>>num1;number(a,num1);cin>>num2;number(a,num2);sum(num1,num2);cout<<endl;}系统编译显示的错误是:2. :unresolvedexternalsymbol"public:__thiscalladdition::addition(int)"(??0addition@@)Debug/2. :1unresolvedexternalsErrorexecutinglink.exe.请问是什么意思?怎么解决?
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