#include<iostream.h>
void main()
{
int n;
cout<<"请输入一个正整数:";
cin>>n;
int total=0;
for(int i=0;i<n;i+=2)
{
if(i+2>n)
break;
total+=i+2;
}
cout<<"偶数和为:"<<total<<endl;
int sum=1;
for(i=1;i<n;i+=2)
{ if(i+2>n)
break;
sum+=i+2;
}
cout<<"奇数和为:"<<sum<<endl;
}
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