﻿ C : Same elements appears at the start and end of an array # C Exercises: Check a given array of integers and return true if the specified number of same elements appears at the start and end of the given array

## C-programming basic algorithm: Exercise-66 with Solution

Write a C program to check a given array of integers and return true if the specified number of same elements appears at the start and end of the given array.

C Code:

``````#include <stdio.h>
#include <stdlib.h>
int main(void){
int arr_size;
int array1[] = {3, 7, 5, 5, 3, 7};
arr_size = sizeof(array1)/sizeof(array1);
printf("%d",test(array1, arr_size, 2));
int array2[] = {3, 7, 5, 5, 3, 7};
arr_size = sizeof(array2)/sizeof(array2);
printf("\n%d",test(array2, arr_size, 3));
int array3[] = {3, 7, 5, 5, 3, 7, 5 };
arr_size = sizeof(array3)/sizeof(array3);
printf("\n%d",test(array3, arr_size, 3));
}

int test(int numbers[], int arr_size, int len)
{
for (int i = 0; i < len; i++)
{
if (numbers[i] != numbers[arr_size - len + i])
{
return 0;
}
}
return 1;
}
``````

Sample Output:

```1
0
1
```

Pictorial Presentation: Flowchart: C Programming Code Editor:

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## C Programming: Tips of the Day

Why doesn't a+++++b work?

printf("%d",a+++++b); is interpreted as (a++)++ + b according to the Maximal Munch Rule!.

++ (postfix) doesn't evaluate to an lvalue but it requires its operand to be an lvalue.

! 6.4/4 says the next preprocessing token is the longest sequence of characters that could constitute a preprocessing token"

Ref : https://bit.ly/3fdldUT