#include <stdio.h>
void sum(int begin,int end)
{
int i;
int sum=0;
for(i=begin;i<=end;i++){
sum += i;
}
printf("%d到%d的和是%d。\n",begin,end,sum);
}
int main()
{int x,y;
scanf("%d %d",&x,&y);
sum(x,y);
}
#include <stdio.h>
void sum(int begin,int end)
{
int i;
int sum=0;
for(i=begin;i<=end;i++){
sum += i;
}
printf("%d到%d的和是%d。\n",begin,end,sum);
}
int main()
{int x,y;
scanf("%d %d",&x,&y);
sum(x,y);
}