c# why does math round up code example

Example 1: c# round up

double resultA = Math.Ceiling(1.02); //Mathf.Ceil for Unity

int resultB = Mathf.CeilToInt(1.02); //Unity Only

Example 2: c# round number up

double number = 1.5362
  
int ceiling = Math.Ceiling(number)
//rounds number to 2