Find the sum of upper & lower traiangular elements

Program:

#include<stdio.h>
#include<conio.h>
void main()
{
    int mat[10][10];
    int i, j, size, upper = 0, lower = 0;
    clrscr();
    printf("Enter size of the square matrix : ");
    scanf("%d", &size);
    printf("\nEnter the elements of the matrix : \n\n");
    for(i = 0; i < size; i++)
    for(j = 0; j < size; j++)
    scanf("%d", &mat[i][j]);
    printf("\nThe upper triangular matrix is : \n\n");
    for(i = 0; i < size; i++)
    {
        for(j = 0; j < size; j++)
        {
            if(i <= j)
            {
                printf("%d\t", mat[i][j]);
                upper = upper + mat[i][j];
            }
            else
            printf("\t");
        }
        printf("\n");
    }
    printf("\nThe lower triangular matrix is : \n\n");
    for(i = 0; i < size; i++)
    {
        for(j = 0; j < size; j++)
        {
            if(j <= i)
            {
                printf("%d\t", mat[i][j]);
                lower = lower + mat[i][j];
            }
            else
            printf("\t");
        }
        printf("\n");
    }
    printf("\nThe sum of upper triangular elements is : %d\n",upper);
    printf("\nThe sum of lower triangular elements is : %d", lower);
    getch();
}

Output:

Enter size of the square matrix : 3
Enter the elements of the matrix :
1 2 3
4 5 6
7 8 9
The upper triangular matrix is :
1 2 3
  5 6
    9
The lower triangular matrix is :
1
4 5
7 8 9
The sum of upper triangular elements is : 26
The sum of lower triangular elements is : 34