Question

How to display the upper triangular matrix in C++

Answer 1

#include <iostream>
 
void printUpperTriangular(int matrix[][3], int rows, int cols) {
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            if (i > j) {
                std::cout << "0" << " ";
            }
            else {
                std::cout << matrix[i][j] << " ";
            }
        }
        std::cout << "\n";
    }
}
  
int main()
{
    int matrix[ ][3] = { {1, 2, 3},
                         {4, 5, 6},
                         {7, 8, 9} };
                         
    int rows = (sizeof(matrix)/sizeof(matrix[0]));  
    int cols = (sizeof(matrix)/sizeof(matrix[0][0]))/rows;                           
 
    printUpperTriangular(matrix, rows, cols);
 
    return 0;
}
 
 
 
 
/*
run:
 
1 2 3 
0 5 6 
0 0 9
 
*/

 

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