// An efficient C program to find
// sum of diagonals
#include <stdio.h>
#include <stdlib.h>
 
const int M = 4;
const int N = 4;
 
void printDiagonalSums(int mat[M][N])
{
    int principal = 0, secondary = 0;
    for (int i = 0; i < N; i++)
    {
        principal += mat[i][i];
        secondary += mat[i][N - i - 1];       
    }
 
    printf("%s","Principal Diagonal:");
    printf("%d\n", principal);
    printf("%s", "Secondary Diagonal:");
    printf("%d\n", secondary);
}
 
// Driver code
int main()
{
    int a[4][4] = {{1, 2, 3, 4},
                   {5, 6, 7, 8},
                   {1, 2, 3, 4},
                   {5, 6, 7, 8}};
    printDiagonalSums(a);
    return 0;
}

C language

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