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程式設計 生日問題
Dec 8th 2013, 21:38

我請問有關C++的問題
題目是 說寫出程式 算出一個團體從 2人 到 20人中, 有兩人或以上會有生日同一天的機率
我的程式如下
#include <iostream>
#include <iomanip>
#include <cmath>
unsigned long factorial(unsigned long);
using namespace std;
int main()
{
int n;
cout <<"請輸入總人數";
cin >> n;
cout<<"此"<<n<<"人中有兩人或以上會有生日同一天的機率為"<<1-((factorial(365)/factorial(365-n))/pow(365,n))<<fixed<<setprecision(2)<<endl;
system("pause");
}
unsigned long factorial(unsigned long num)
{
unsigned long x=1;
for(int i=num; i>=1; i--)
x*=i;
return x;
}
我覺得我這樣寫應該是沒錯啊 但是編譯不出來
可以幫我修改並告訴我錯在哪裡嗎 謝謝喔 感恩

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