What is the use of the sizeof operator in C?

sizeof returns the size in bytes of a type or a variable. It is calculated at compile time and has the type size_t.

#include <stdio.h>

int main(void) {
    int arr[10];

    printf("%zu\n", sizeof(int));
    printf("%zu\n", sizeof(arr));
    printf("%zu\n", sizeof(arr) / sizeof(arr[0]));
    return 0;
}

Output:

The last line is the common way to find the number of elements of an array. Use %zu to print the value.

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