Talk:Constant (computer programming)
Latest comment: 6 years ago by 213.67.240.59 in topic Inaccurate introduction
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Inaccurate definition edit
can a constant be a kind of variable ? maybe it is a data type. —Preceding unsigned comment added by 82.137.200.8 (talk) 17:40, 19 November 2010 (UTC)
Inaccurate introduction edit
"In computer programming, a constant is a special kind of variable whose value cannot be altered during program execution." This isn't completely accurate as there are exceptions to the 'rule'. The following C++ code will change the value of a constant:
const int a = 1;
int *ptr_a = (int*)(&a);
cout << a; // outputs 1
*ptr_a = 2; // legal statement
cout << a; // outputs 2
It is also possible to change a #define defined symbolic constant much easier. Andrew (talk) 00:12, 30 July 2009 (UTC)
- The code posted here has undefined behaviour. 213.67.240.59 (talk) 14:16, 17 October 2017 (UTC)