include<stdio.h>
int main()
{
int i,j,n;
long p,sum=0;
while(1)
{
printf("intput n:");
scanf("%d",&n);
for (i=1;i<=n;i++)
{
p=1;
for (j=1;j<=i;j++)
{
p=p*j;
}
sum=sum+p;
}
printf("1!+2!+···+%d!=%1d\n",n,sum);
}
return 0;
}
知识点:1学会嵌套循环,2学会插入多次使用语句{ while(1) } [偷学]
感悟:多学多写熟悉循环语句!!