求 n 的阶乘
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试题描述
输入一个正整数n，求n! n!=1* 2* 3*…*n
输入要求
输入一个正整数n
输出要求
一行，包行一个整数代表n阶乘的值
输入样例
5
输出样例
120
知识点及提示
5!=1*2 *3 *4 *5=120