C++/Qt4 linux - casting (ti.tv_usec * ti.tv_sec) to long long

[jimbo]

Hello,

I'm using the code shown to generate random numbers.

timeval ti;
 
    gettimeofday(&ti, NULL);
    qsrand(qsrand((long long)ti.tv_usec * (long long)ti.tv_sec);
    qDebug() << (long long)((long long)ti.tv_usec * (long long)ti.tv_sec);
 
    num = (rand() % maxNum + 1);

timeval ti;

    gettimeofday(&ti, NULL);
    qsrand(qsrand((long long)ti.tv_usec * (long long)ti.tv_sec);
    qDebug() << (long long)((long long)ti.tv_usec * (long long)ti.tv_sec);

    num = (rand() % maxNum + 1);

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1151813750172254 
1152103117531054 
1020841750830240 
1033346761335855

1151813750172254 
1152103117531054 
1020841750830240 
1033346761335855

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Is there any difference to the result in using:-

qsrand((long long)ti.tv_usec * (long long)ti.tv_sec);

qsrand((long long)ti.tv_usec * (long long)ti.tv_sec);

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against

qsrand(ti.tv_usec * ti.tv_sec);

qsrand(ti.tv_usec * ti.tv_sec);

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Both seem to give acceptable results.

Regards