class类的调用

[koko2710]

#include <iostream>
#include <stdio.h>

struct La
{
La (int i, int j)
{
this->li = i;
this->lj = j;
printf("li == %d [] lj == %d \n",li,lj);
}
int li;
int lj;
};

class Lb {
public:
void joinA(int i, int j){
this->ti=i;
this->tj=j;
}

void printA()
{
printf( "this->ti == %d [][] this->tj == %d \n", ti,tj);
}
protected:
int ti;
int tj;
};

int main()
{
int a=3,b=4,c=5,d=6;
La t1(a,b);
Lb t2;

t2.joinA(a,b);
t2.printA();
t2.joinA(c,d);
t2.printA()


}
请问一下 这里如何调用T1的li ,lj 使 ti==a lj == b,而不需要再用t2.joinA(a,b);
这个问题困扰多日 求解

[evifree]

t2.joinA(t1.li,t1.lj);

[koko2710]

#include <iostream>
#include <stdio.h>

struct La
{
La (int i,int j)
{
this->li = i;
this->lj = j;
printf("li == %d [] lj == %d \n",li,lj);
}
int li;
int lj;
};


class Lb {
private:
struct La _laa;
public:
void printA()
{
printf( "_laa.li == %d [][] _laa.lj == %d \n", _laa.li,_laa.lj);
}
};

int main()
{
int a=3,b=4;
La t1(a,b);
Lb t2;
t2.printA();
}

经高人指点，改了以后不能编译。。。

[zbing0203]

La加个默认构造函数

[zbing0203]

struct La
{
La()
{
}
La (int i,int j)
{
this->li = i;
this->lj = j;
printf("li == %d [] lj == %d \n",li,lj);
}
int li;
int lj;
};

[zbing0203]

struct La
{
La()
{
}
La (int i,int j)
{
this->li = i;
this->lj = j;
printf("li == %d [] lj == %d \n",li,lj);
}
int li;
int lj;
};

[koko2710]

谢谢楼上 已经解决。
新手还是很多不懂啊～～