how do you write OR in if condition at c code example

Example 1: syntax of if stmt

if (condition)
{
     //Block of C statements here
     //These statements will only execute if the condition is true
}

Example 2: if statement in c

#include <studio.h>
int main()
{
  if (logic goes here)
  {
    CODE
  }
  else if (logic)
  {
    CODE
  }
  else{
    CODE
  }
  return 0
}