#include <stdio.h>
 
int main() {
    int a[10][10];
    int *p;
    int rows, cols, i, j;
    int trace = 0, sum_primary = 0, sum_secondary = 0;
 
    printf("Enter number of rows and columns (square matrix): ");
    scanf("%d %d", &rows, &cols);
 
    if (rows != cols) {
        printf("Matrix must be square to find trace and diagonals!\n");
        return 0;
    }
 
    printf("Enter elements of the matrix:\n");
    for (i = 0; i < rows; i++) {
        for (j = 0; j < cols; j++) {
            scanf("%d", &a[i][j]);
        }
    }
 
    p = &a[0][0];  // Pointer to the first element of the matrix
 
    // Calculate trace and diagonal sums using pointers
    for (i = 0; i < rows; i++) {
        sum_primary += *(p + i * cols + i);              // Primary diagonal
        sum_secondary += *(p + i * cols + (cols - i - 1)); // Secondary diagonal
    }
 
    trace = sum_primary; // Trace is same as sum of primary diagonal
 
    printf("\nMatrix:\n");
    for (i = 0; i < rows; i++) {
        for (j = 0; j < cols; j++) {
            printf("%d ", a[i][j]);
        }
        printf("\n");
    }
 
    printf("\nTrace of the Matrix: %d\n", trace);
    printf("Sum of Primary Diagonal: %d\n", sum_primary);
    printf("Sum of Secondary Diagonal: %d\n", sum_secondary);
 
    return 0;
}