Illogical Type Changing

hey..im new arduino..i m experienced in c programming..i m gonna give little example..

quote

long int myresult;

void setup()
{
serial.begin(9600);
}

void loop()
{
  myresult=1400*1000;
  serial.println(myresult);
  while(1);
  
}

in example..programe gave me illogical answer.. if changed types of 1400 , 1000 "long int" , right answer..but why have change type of these integer? these not long integer..of course result of 2 short integers's multiplication might long integer, here..so changed type of result..do u think logical? whats reason of usage? u think?

nothing @ illogical 16 bit arithmetic.

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