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);
} Recommended tutorial: c language tutorial
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