Trying to understand why a '?' and ':' (colon) are used in a BME280 calculation.

[wmazz]

int32_t var1
 
 var1 = (var1 < 0 ? 0 : var1)
 var1 = (var1 > 419430400 ? 419430400 : var1)

Can someone help me understand this code from a BME280 humidity
sensor. I am interested in how the ? (question mark) and : (colon)
is used, and how it changes or modifies var1.

Thanks

Bill M.

Search engines doesn't like the ?, :

[groundFungus]

Try a search for "Arduino ternary".

[UKHeliBob]

Equivalent to

if (var1 > 419430400)
{
  var1 = 419430400;
}
else
{
  var1 = var1;
}

but could be reduced to

if (var1 > 419430400)
{
  var1 = 419430400;
}

[wmazz]

Thank you for your prompt replies

[J-M-L]

link to the documentation of the conditional operator (colloquially referred to as ternary operator or condition) for whoever would end up reading this post in the future

// checks the boolean value of the first expression (a) and, 
// depending on the resulting value, evaluates and returns 
// either the second (b) or the third (c) expression
a ? b : c;