Question

从键盘输入二个整数,计算输出他们他们之间所有数之和

Answer 1

C语言的代码：
#include<stdio.h>
int main()
{
long n,a,b,s;
scanf("%ld%ld",&a,&b);
if(a>b){n=a;a=b;b=n;}
s=(a+b)*(b-a+1)/2;
printf("Sum=%ld\n",s);
system("pause");
return 0;
}