前言：
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#include <bits/stdc++.h>
using namespace std;
int main ()
{
int shouxiang,moxiang,xiangshu,qiuhe;
cout<<"请输入首项：";
cin>>shouxiang;
cout<<"请输入末项：";
cin>>moxiang;
cout<<"请输入项数：";
cin>>xiangshu;
qiuhe = (shouxiang+moxiang)*xiangshu/2;
cout<<shouxiang<<"加到"<<moxiang<<"的和为："<<qiuhe;
return 0;
}
求末项：
#include <bits/stdc++.h>
using namespace std;
int main ()
{
int shouxiang,moxiang,gongcha,xiangshu,qiuhe;
cout<<"请输入首项：";
cin>>shouxiang;
cout<<"请输入项数：";
cin>>xiangshu;
cout<<"请输入公差：";
cin>>gongcha;
moxiang=shouxiang+(xiangshu-1)*gongcha;
cout<<"末项为："<<moxiang;
return 0;
}
求项数：
#include <bits/stdc++.h>
using namespace std;
int main ()
{
int shouxiang,moxiang,gongcha,xiangshu;
cout<<"请输入首项：";
cin>>shouxiang;
cout<<"请输入末项：";
cin>>moxiang;
cout<<"请输入公差：";
cin>>gongcha;
xiangshu = (moxiang-shouxiang)/gongcha+1;
cout<<shouxiang<<"到"<<moxiang<<"的项数为："<<xiangshu;
return 0;
}
附儿子默写的等差数列公式，不忍直视！
