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//6.1.test.cpp
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#include <iostream>
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using namespace std;
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int fact(int x);//如果函数出现在调用之后，需要声明
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int main(){
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cout << "请输入一个数，将计算它的阶乘" << endl;
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int x;
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cin >> x;
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cout << "阶乘为:";
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cout << fact(x) << endl;
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return 0;
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}
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int fact(int x){
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int i,j;
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for(i=1;i<=x;i++){
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j =i*j;
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}
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return j;
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}
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