An Example -Nested for loops

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Here is an example of a 12 by 12 multiplication table:

	1	2	3	4	5	6	7	8	9	10	11	12
1!	1	2	3	4	5	6	7	8	9	10	11	12
2!	2	4	6	8	10	12	14	16	18	20	22	24
3!	3	6	9	12	15	18	21	24	27	30	33	36
4!	4	8	12	16	20	24	28	32	36	40	44	48
5!	5	10	15	20	25	30	35	40	45	50	55	60
7!	7	14	21	28	35	42	49	56	63	70	77	84
8!	8	16	24	32	40	48	56	64	72	80	88	95
9!	9	18	27	36	54	63	72	81	90	99	108	117
10!	10	20	30	40	50	60	70	80	90	100	110	120
11!	11	22	33	44	55	66	77	88	99	110	121	132
12!	12	24	36	48	60	72	84	96	108	120	132	144

We might also see that the answers could be designed as a collection of cells (each cell being exactly six spaces wide). The C++ source code to produce the above is:

Example 15.5: C++ source code: nested for loops -multiplication table

cout << " ";for(across=1; across <13; across++)  {  cout << setw(4) << across << " |";  }cout << endl;
cout << " ";for(across=1; across <13; across++)  {  cout << "------";  }cout << endl;
for(down=1; down <13; down++)  {  cout << setw(4) << down << " !";  for(across=1; across <13; across++)    {    cout << setw(4) << down*across << " |";    }  cout << endl;  }

Figure 15.4 Colorized Code - multiplication table

Figure 15.5 Colorized Output -multiplication table

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An Example -Nested for loops