"C" compares the same elements in two arrays

We all know that to determine whether there are identical elements in two arrays, only two layers for loops are required, but in the inside of the For loop, we have to notice when to jump out of the loop, which is very important, cannot be output all the time, but not both output and output.

Here is the first method:

#define _crt_secure_no_warnings 1 
#include <stdio.h>
#include <stdlib.h>
int main ()
{
	int arr1[4] = {0};
	int arr2[5] = {0};
	int i = 0,j=0,k=0;
	printf ("Please enter array 1 (4 elements): \ n");
	for (i = 0;i<sizeof (arr1)/sizeof (arr1[0)); i++)
	{
		scanf ("%d", &arr1[i]);
	printf ("Please enter array 2 (5 elements): \ n");
	For (i=0;i<sizeof (ARR2)/sizeof (arr2[0)); i++)
	{
		scanf ("%d", &arr2[i]);

	for (j = 0; j<sizeof (arr1)/sizeof (Arr1[0]); j + +)
	{for
		(k = 0;k<sizeof (arr2)/sizeof (arr2[0)); k++)
		{
			if (arr1[j] = = Arr2[k])
			{
				printf ("has the same element.) \ n ");
			}
			if (k<sizeof (ARR2)/sizeof (arr2[0]))	
			{break
				;
			}
		}
		if (j>=sizeof (arr1)/sizeof (arr1[0))	
		printf ("No identical elements.") \ n ");
	}
	return 0;
}

The above method needs to be judged more, and judge the place to be sure, the following method will be simpler:

#define _crt_secure_no_warnings 1 
#include <stdio.h>
#include <stdlib.h>
int main ()
{
	int arr1[4] = {0};
	int arr2[5] = {0};
	int i = 0,j=0,k=0;
	printf ("Please enter array 1 (4 elements): \ n");
	for (i = 0;i<sizeof (arr1)/sizeof (arr1[0)); i++)
	{
		scanf ("%d", &arr1[i]);
	printf ("Please enter array 2 (5 elements): \ n");
	For (i=0;i<sizeof (ARR2)/sizeof (arr2[0)); i++)
	{
		scanf ("%d", &arr2[i]);

	for (j = 0; j<sizeof (arr1)/sizeof (Arr1[0]); j + +)
	{for
		(k = 0;k<sizeof (arr2)/sizeof (arr2[0)); k++)
		{
			if (arr1[j] = = Arr2[k])
			{
				printf ("has the same element.) \ n ");
				return 0;
	}}} printf ("Does not have the same element.) \ n ");
	return 0;
}