can't handle double type parameters

[fang]

When I add the double type into the project, the variable value is out of order.

For example,
I use the atof function, input is "39.931152", output is "39.931152".

A little change for atof as below:

double j_atof(const char *a, double def)
{
    if(a == NULL)
        return def;
    else
        return atof(a);
}

the same input, but return value is "0.000000" or other value in different machine. Seems it can't get the correct value from the registers.