how to limit(clamp) struct values in C

Question

I would like to find an efficient way to limit the values of the members in a struct. So far I am checking all the members one by one with "if-esle if" for min max values

if(months.January>31)
{
January=31
}
else if(months.January<1)
{
January=1;
}
if(months.February>28)
{
February=28
}
else if(months.February<1)
{
February=1;
}

Answer 1

These are some macros that I been using since forever, for min, max and clamp.

#define MIN(a,b) (((a)<(b))?(a):(b))
#define MAX(a,b) (((a)>(b))?(a):(b))
#define CLAMP(x, lower, upper) (MIN((upper), MAX((x), (lower))))

So, for your january example:

months.January = CLAMP(months.January, 1, 31);