用C++编写一个程序，对一个整数数组的偶数求和

Answer 1

对数组的偶数下标的元素求和
//---------------------------------------------------------------------------
#include
<iostream>
class
iteg{
int
*data;
int
size;
public:
iteg(int
n,int
b):size(n)
/*构造函数，n是整数数组数字的个数，b是起始数字*/
{
data=new
int[n];
for
(int
i
=
0;
i<n;
i++)
{
data[i]=b+i;
}
}
long
int
sum(void)
const
{
long
int
s(0);
for
(int
i
=
0;
i
<
size;
i+=2)
{
s+=data[i];
}
return
s;
}
~iteg(){delete[]
data;}
};
int
main(int
argc,
char*
argv[])
{
iteg
a(100,0);
std::cout<<a.sum()<<std::endl;
return
0;
}
//---------------------------------------------------------------------------