Use of nested loops and output instances

Nested loop , Generally multiple for loop , Realize multi-dimensional output through nested use of loops .

1. In a double cycle , Generally, it is the number of outer loop control lines , The number of inner loop control columns ,

2. The inner loop is traversed once , The outer layer only completes a complete cycle .

3. If the outer loop executes m Time , Inner loop execution n Time , Then the inner loop body is executed mn Time .

example , Output this pattern on the console ：

Code implementation ：

design sketch ：