c++ - Get Index Given Row and Column -


is there formula can used index given current column , row? following have far. problem is, however, code works first row...

for (int = 0; < rows; i++) {     (int j = 0; j < columns; j++)     {         index = * (columns - 1) + j;     } }

this should work: 

        index = * columns + j;

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