階乘和sum.cpp 已知正整數n(n<=100),設s=1!+2!+3!+……+n!。請編程實現:輸入正整數n,求s

void main()

{

int n,a,s;

printf("輸入n\n");

scanf("%d",n);

for (int i=1;i<n+1;i++)

{ a=1;

for(int j=1;j<=i;j++)

a=a*j;

s=s+a;

}

printf("%d",s)

}