406
# include<stdio.h> double fact(int n); int main(void) { int i; double sum; sum=0; for(i=1;i<=100;i++) sum=sum + fact(i); printf("1!+2!+...+100!=%e\n",sum); return 0; } double fact(int n) { int i; double result; result=1; for(i=1;i<=n;i++) result=result*i; return result; }