5-14 求整数段和 (15分)

#include <stdio.h>int main(){    int a,b,sum;int i;int count;scanf("%d %d",&a,&b);i=a;count=0;while(i<=b){count++;if(i==-100){printf(" %d",i);}else if(i<=-10&&i>=-99){printf("  %d",i);}else if(i<=-1&&i>=-9){printf("   %d",i);}else if(i<=9&&i>=0){printf("    %d",i);}else if(i<=99&&i>=10){printf("   %d",i);}else if(i==100){printf("  %d",i);}i++;if(count==5){printf("\n");count=0;}}if(count!=0){printf("\n");}sum=(a+b)*(b-a+1)/2;printf("Sum = %d",sum);}