Operands for sizeof operator

In C, sizeof operator works on following kind of operands:

1) type-name: type-name must be specified in parentheses.

sizeof (type-name) 

2) expression: expression can be specified with or without the parentheses.

sizeof expression

The expression is used only for getting the type of operand and not evaluated. For example, below code prints value of i as 5.

#include <stdio.h>
  
int main()
{
 int i = 5;
 int int_size = sizeof(i++);
 printf("\n size of i = %d", int_size);
 printf("\n Value of i = %d", i);
  
 getchar();
 return 0;
}

Output of the above program:
size of i = depends on compiler
value of i = 5

References:
http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/V40G_HTML/AQTLTCTE/DOCU0015.HTM
http://www.gnu.org/software/gnu-c-manual/gnu-c-manual.html#The-sizeof-Operator



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