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G-Fact 1 | (Sizeof is an operator)

  • Difficulty Level : Easy
  • Last Updated : 31 Oct, 2020

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

This article is contributed Shivam Gupta. If you like GeeksforGeeks and would like to contribute, you can also write an article and mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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