L1-008. 求整数段和

//注意格式要求#include <stdio.h>int main(){    int A,B,sum=0,n=0;    scanf("%d%d",&A,&B);    while(A<=B)    {        printf("%5d",A);        sum+=A;        A++;        n++;        if(n%5==0)printf("\n");    }    if(n%5!=0)printf("\n");    printf("Sum = %d",sum);    return 0;}