Float Question

Hi, I have a problem
I must do several arithmetics operations with integer decimals numbers but I have the following prolem :

618 / 100.00 = 6.17999997

and I need 6.1800 as result.

I don't find the way to round the precision to 4 decimals .
Does anybody know how to do this?

Thanks in advance...

Code:

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int main ( ) {
    float foo =  618 / 100.00;
    printf( "%.4f\n", foo );
    return 0;
}

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