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// i suppose it is a square matrix... lower and upper half...
#define  m  10
#define n 10

#include <iostream>

int main()
   int  i,j, A[m][n];

       lowerhalf(int &A[0][n], m, n);
     return 1;

void lowerhalf(int **A, int m, int n)
    int i, j;
        for (i = 0; i < m; i++) {    // in each row print as many as the row number
            for (j  =0; j < i ; j++)  cout << A[i][j]  << " " ; 
            cout << '\n';

1 5 1
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