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//可以随便更改的test函数，每次用完了就丢弃，随时可以改。
void test(void)
{
int in1,in2,sum;
cout<<"Input one integer:"<<endl;
cin>>in1;
cout<<"Input the second integer:"<<endl;
cin>>in2;
if(in1>in2)
{
int i;
i=in1;
in1=in2;
in2=i;
}
sum=0;
int i;
for(i=in1;i<=in2;i++)
{
sum+=i;
}
cout<<"The sum of the integers from "<<in1<<" to "<<in2<<" is "<<sum<<" ."<<endl;
}