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C program to find the size of the array using macro

Here, we are going to learn how to find the size of the array using macro in C programing language?
Submitted by Nidhi, on July 12, 2021

Problem statement

Given an array, we have to create a macro to find the size of the given array using C program.

Finding size of array using macro

The source code to find size of array using macro is given below. The given program is compiled and executed using GCC compile on UBUNTU 18.04 OS successfully.

C program to find the size of the array using macro

// C program to find size of array using macro

#include <stdio.h>

#define SizeOfArray(arr) sizeof(arr) / sizeof(arr[0])

int main()
{
    int arr[] = { 1, 2, 3, 4, 5 };

    printf("Size of array 'arr' is: %ld\n", SizeOfArray(arr));

    return 0;
}

Output

Size of array 'arr' is: 5

Explanation

Here, we created an array arr of 5 integers which initialized with 1, 2 ,3, 4, 5 elements. We also created a macro SizeOfArray() to get the size of the array. Then we printed the result on the console screen.

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