PRINT THE SUM OF DIAGONALS

Problem statement:

Print the sum of diagonals.

E.g.:

Consider the following matrix for n=3

7 8 9

6 1 2

5 4 3

the sum of the diagonal elements is 25 

Input: 

5

Output:

101

Code:

#include <stdio.h>

int main()

{

    int n,sum,count,itr,i,val;

    scanf("%d",&n);

    if(n%2==0)

    {

                val=1;itr=2; sum=0;count=0;

    }

     else

     {

       val=2;itr=3; sum=1;count=1;

     }

     

      

      

        while(itr <= n)

        {

            for(i=0;i<4;i++)

              {

                 count=count+val;

                 sum=sum+count;

              }

        itr=itr+2;val+=2;

        }

        printf("%d\n",sum);

   

    return 0;

}

OUTPUT: