Question

How to invers print matrix (from [ROW - 1][COL - 1]) in C

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <time.h>  

#define ROW 3
#define COL 4

void print_matrix(int m[][COL]);
void print_matrix_invers(int m[][COL]);

int main(void)
{
    int i, j, matrix[ROW][COL] = { {0}, {0} };
   
    srand(time(NULL));
    for (i = 0; i < ROW; i++)
        for (j = 0; j < COL; j++)
            matrix[i][j] = rand() % 10 + 1;
    
    printf("print matrix:\n");
    print_matrix(matrix);
    printf("inverse print matrix:\n");
    print_matrix_invers(matrix);
    
    return 0;
}

void print_matrix_invers(int m[][COL])
{
    int i, j;
     
    for (i = ROW - 1; i >= 0; i--)
    {
        for (j = COL - 1; j >= 0; j--)
            printf("%5i", m[i][j]);
            
        printf("\n");
    }
}
void print_matrix(int m[][COL])
{
    int i, j;
      
    for (i = 0; i < ROW; i++)
    {
        for (j = 0; j < COL; j++)
            printf("%5i", m[i][j]);
          
        printf("\n");
    }
}

/* 
run:

print matrix:
    5    1    5    1
   10    2    1    7
    1    9    7    5
inverse print matrix:
    5    7    9    1
    7    1    2   10
    1    5    1    5

*/

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