为什么出现两个warning(s)!






#include "stdafx.h"
#include<iostream.h>
class CSum
{
public:
CSum(int a,int b)
{
sum=a+b;
}
int getsum()
{
return sum;
}
private:
int t,sum;
};
int main(int argc, char* argv[])
{
int x,y;
CSum one(x,y);
cout<<"输入两个数:";
cin>>x>>y;
cout<<one.getsum()<<endl;

return 0;
}



--------------------Configuration: chengxu002 - Win32 Debug--------------------
Compiling...
chengxu002.cpp
F:\VC++\VC++程序\MSDev98\MyProjects\chengxu002\chengxu002.cpp(23) : warning C4700: local variable 'y' used without having been initialized
F:\VC++\VC++程序\MSDev98\MyProjects\chengxu002\chengxu002.cpp(23) : warning C4700: local variable 'x' used without having been initialized
Linking...

chengxu002.exe - 0 error(s), 2 warning(s)

//CSum( int a = 0, int b = 0 ) 中a，b没有默认值

#include "stdafx.h" //这里好像用不到
#include<iostream.h>

class CSum
{
public:
CSum( int a = 0, int b = 0 )
{
sum = a + b;

t = 0; // 如果有用，初始化
}
int getsum()
{
return sum;
}
private:
int t; // 这个好像也没用到

int sum;
};

int main( int argc, char* argv[] )
{
int x;
int y;

cout<<"输入两个数:"; //注意

cin>>x>>y; //这几行

CSum one(x,y); // 顺序

cout<<one.getsum()<<endl;

return 0;
}

[此贴子已经被作者于2006-11-25 17:12:45编辑过]