L1-008 求整数段和

题解：

#include<iostream>
#include<cstring>
#include<algorithm>
using namespace std;
int main()
{
    int a,b,i=0,sum=0;
    cin>>a>>b;
    while(a<=b)
    {
        printf("%5d",a);
        i++;
        if(i%5==0)cout<<endl;
        sum+=a;
        a++;
    }
    if(i%5!=0)cout<<endl;
    cout<<"Sum = "<<sum<<endl;
    return 0;
}