Function SCIPfindSimpleRational 

pub unsafe extern "C" fn SCIPfindSimpleRational(
    lb: f64,
    ub: f64,
    maxdnom: c_longlong,
    numerator: *mut c_longlong,
    denominator: *mut c_longlong,
) -> c_uint

given a (usually very small) interval, tries to find a rational number with simple denominator (i.e. a small number, probably multiplied with powers of 10) out of this interval; returns TRUE iff a valid rational number inside the interval was found