Problem using tgamma() function

abdalimran (119)
tgamma() function shows different result for same logic. Code are given below..

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#include <iostream>
#include <cstdio>
#include <cmath>

using namespace std;

int main()
{
    int n;

    while(cin>>n)
    {
        int fact = tgamma(n+1);
        cout<<fact<<endl;
    }

    return 0;


Input: 6
Output: 719


But when i write as following:

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#include <iostream>
#include <cstdio>
#include <cmath>

using namespace std;

int main()
{
    int n;

    while(cin>>n)
    {
        cout<<tgamma(n+1)<<endl;
    }

    return 0;


Input: 6
Output: 720

Why the difference? What happens here?
mik2718 (347)
tgamma returns a double

so the first one casts it to an int, the second one doesn't
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