Function SCIPselectSimpleValue 

pub unsafe extern "C" fn SCIPselectSimpleValue(
    lb: f64,
    ub: f64,
    maxdnom: c_longlong,
) -> f64

given a (usually very small) interval, selects a value inside this interval; it is tried to select a rational number with simple denominator (i.e. a small number, probably multiplied with powers of 10); if no valid rational number inside the interval was found, selects the central value of the interval