Question

How to get the length of the boundaries of a matrix in C

Answer 1

#include <stdio.h>

#define COLS 6
   
int GetBoundariesLength(int matrix[][COLS], int rows, int cols) {
    return (rows * 2) + (cols * 2) - 4;
}
   
   
int main()
{
    int matrix[][COLS] = { { 1,   2,   3,   4,  0,  8 },
                           { 5,   6, 100,   8,  1, 21 },
                           { 2, 100,   8, 100,  3,  0 },
                           { 1,   7, 100,   9,  6, 32 },
                           { 9,  10,  11,  12, 13, 55 } };
   
    int rows = sizeof matrix / sizeof matrix[0];
    int cols = sizeof matrix[0] / sizeof(int);

    printf("%d", GetBoundariesLength(matrix, rows, cols));
    
    return 0;
}
   
   
   
   
/*
run:
   
18
   
*/

 

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