﻿ C Program: Multiply each array element by previous and next

# C Exercises: Update every array element with multiplication of previous and next numbers in array

## C Array: Exercise-103 with Solution

Write a program in C to update every array element with multiplication of previous and next numbers in array.

Sample Solution:

C Code:

``````#include<stdio.h>
void newArryPrevNext(int arr1[], int n)
{
if (n <= 1)
return;
int pre_elem = arr1[0];
arr1[0] = arr1[0] * arr1[1];
for (int i=1; i<n-1; i++)
{
int cur_elem = arr1[i];
arr1[i] = pre_elem * arr1[i+1];
pre_elem = cur_elem;
}
arr1[n-1] = pre_elem * arr1[n-1];
}
int main()
{
int arr1[] = {1,2, 3, 4, 5, 6};
int n = sizeof(arr1)/sizeof(arr1[0]);
int i = 0;
//------------- print original array ------------------
printf("The given array is:  \n");
for(i = 0; i < n; i++)
{
printf("%d  ", arr1[i]);
}
printf("\n");
//-----------------------------------------------------------
printf("The new array is: \n");
newArryPrevNext(arr1, n);
for (int i=0; i<n; i++)
printf("%d ", arr1[i]);
return 0;
}
```
```

Sample Output:

```The given array is:
1  2  3  4  5  6
The new array is:
2 3 8 15 24 30
```

Pictorial Presentation:

Flowchart:

C Programming Code Editor:

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## C Programming: Tips of the Day

C Programming - What is the argument for printf that formats a long?

Put an l (lowercased letter L) directly before the specifier.

```unsigned long n;
long m;

printf("%lu %ld", n, m);
```

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