C language to calculate the cumulative sum of factorials

Specific code:

# include "stdio.h"
void main()
{
  int n,i,j,sum=0,t=1;
  printf("please enter a number:");
  scanf("%d",&n);
  for(i=0;i<n;t=1,i++)   //这里的循环事件是重点！每循环一次重新给t赋值。
    { 
       for(j=n-i;j>0;j--)
    {
t*=j;
}
   sum+=t;
   }
   printf("\n1!+....+%d!=%d",n,sum);
}

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