明解Ｃ言語 入門編 > 5. 配列 > ２行３列の行列を加算する (多次元配列) Ruby ma = [[1, 2, 3], [4, 5, 6]] mb = [[6, 3, 4], [5, 1, 2]] mc = [[], []] for i in 0..1 for j in 0..2 printf("%3d", mc[i][j]) end puts "" end for i in 0..1 for j in 0..2 …