Data types and sizes

Question

Comments

sizeof(c+i) =4.  How??

---

character +integer =integer

Answer 1

For this we need to know the rules of type conversion during arithmetic operation..Quoted from Kerninghan And Ritchie textbook :

· If either operand is long double, convert the other to long double.
· Otherwise, if either operand is double, convert the other to double.
· Otherwise, if either operand is float, convert the other to float.
· Otherwise, convert char and short to int.
· Then, if either operand is long, convert the other to long.

 So here before applying sizeof() operator we should know the type of the addition result of c and i which is addition of type char and short int..According to rule 4 as mentioned above both of these data types will be converted to int data type prior to addition..Thus the result will have int data type and given size of int is 4 bytes..

Hence , sizeof(c+i) will give us 4 as result..

Hence C) should be the correct answer.. 

Comments

Thank you so much for this.

---

but c+i c is character and i is short int so it should be converted to short int which is 2 bytes higher than 1 byte of character but why it is converting to integer???