求階乘，輸入一個正整數 n，輸出n！

#include<stdio.h> int factorial (int n); int main(){ int n; scanf("%d",&n); printf("%d \n",factorial(n)); return 0; } int factorial(int n){ int i,fact=1; for(i=1;i<=n;i++) fact = fact*i; return fact;

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