#include<stdio.h> int main() { int n,i; scanf("%d",&n); int sum=0,result=1;//易错点:result初始化为0 for (i=1;i<=n;i++) { result*=i; sum+=result; } printf("%d",sum); return 0; }
#include<stdio.h> int main() { int n,i; scanf("%d",&n); int sum=0,result=1;//易错点:result初始化为0 for (i=1;i<=n;i++) { result*=i; sum+=result; } printf("%d",sum); return 0; }