G-Fact 1 | (Sizeof is an operator)

In C language, sizeof( ) is an operator. Though it looks like a function, it is an unary operator.

For example in the following program, when we pass a++ to sizeof, the expression “a++” is not evaluated. However in case of functions, parameters are first evaluated, then passed to function.

// C program to demonstrate that sizeof
// is an operator
#include<stdio.h>

int main()
{
    int a = 5;
    printf("%d\n", (int)sizeof(++a));
    printf("%d", a);
    return 0;
}

Output :

4
5

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