最后一个加号要怎么处理掉

#include<stdio.h>
int main()
{
int n;
scanf("%d",&n);
int i=0,sum=0;
while(i<n)
{
i=i+1;
sum=sum+i;

printf("%d+",i);

}
printf("=%d",sum);
}

printf("=%d",sum);改成printf("\b=%d",sum);