29.14. A further example
To finish this chapter, here is another example of how you can access beyond the boundaries of an array [19] in unsafe codes. Study this program carefully – it should be self-explanatory.
[19] This is impossible in Java or safe C# codes, but could be done easily in C and C++ where array boundaries are not checked for the developer.
1: using System;
2:
3: class TestClass{
4:
5: static string name = "c sharp";
6:
7: unsafe static void PerformOp(char* p) {
8: int i;
9:
10: // will print out 'c sharp' (7 characters)
11: for (i=0; p[i]!=' '; i++)
12: Console.Write(p[i]);
13:
14: // will print out 13 more characters which
15: // are beyond the array boundaries.
16: for (int j=i; j<20; j++)
17: Console.Write(p[j]);
18: }
19:
20: unsafe static void Main() {
21: fixed (char* p = name)
22: PerformOp(p);
23: }
24: }
Output: [20]
[20] Output may differ depending on what is stored beyond your array's allocated space.
c sharp ?? A
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