| //Paul A. Gagniuc. An Introduction to Programming Languages: Simultaneous Learning in Multiple Coding Environments. Synthesis Lectures on Computer Science. Springer International Publishing, 2023, pp. 1-280. | |
| //Additional algorithm 26. It demonstrates the use of nested for-loops. It shows the traversal of a two-dimensional array by a nested for-loop structure. A 2D-array variable (A) is declared with mixed datatypes, namely with string literals and number literals. A string variable t is initially set to empty. Another two variables (ie. i and j) are initialized with value zero and are the main counters of nested for-loops. The upper limit of each for-loop is established by the two dimensions, namely the number of rows and columns from matrix A. The two for-loops traverse the elements of array A by using the counters i and j as an index. At each iteration, the value from an element is added to the content of variable t. Once the end of the nested for-loops is reached, the value collected in variable t is printed in the output for inspection. The end result is the enumeration of each value in the output, in a linear manner. Note that the source code is in context and works with copy/paste. | |
| using namespace std; | |
| int main() | |
| { | |
| string A[][2] = { | |
| {"a","b"}, | |
| {"c","d"}, | |
| {"e","f"}, | |
| {"g","h"}, | |
| }; | |
| string t = ""; | |
| int n = sizeof(A) / sizeof A[0]; | |
| int m = sizeof A[0] / sizeof(string); | |
| for (int i = 0; i < n; i++) { | |
| for (int j = 0; j < m; j++) { | |
| t += "A["+to_string(i); | |
| t += "]["+to_string(j); | |
| t += "]="+A[i][j]+"\n"; | |
| } | |
| } | |
| cout<<t; | |
| return 0; | |
| } | |