variable for array ?

hi all~

i remembered one-dimentional array requires const as argument when it was established but now i can pass variable to it ? i update Dev-C++ not long ago i wonder whethere it was exception of Dev-C++ compiler, my code is right below:

Code:

---

int main()
{
    int n = 10;
    int arr[n];    // No error occured !!!
    return 0;
}

---

any ideas ?

Some compilers have an extension that allows non-constant array sizes. You can use it, but your code won't be portable. The standard way to do this is with dynamic memory allocation:

Code:

---

int
main()
{
  int  n = 10;
  int *arr = new int[10];

  ...
}

---

But of course, the standard library should be preferred over ad hoc code:

Code:

---

#include <vector>

int
main()
{
  int              n = 10;
  std::vector<int> arr(n);

  ...
}

---

That's valid in C99 and is enabled by default as a compiler extension in GCC.

Ref: http://gcc.gnu.org/onlinedocs/gcc-3....iable%20Length

gg