can user declare the size of array?

[mukhtar]

how can, an array have the size specified by the user?

[Banfa]

If you are using C++ then use std::vector declared after the user has input the size.

If you are using C99 then just declare the array after you have got the input from the user using a input variable for its size.

If you are using C89 then use malloc to allocate the array after the user has input the required size.

[hosting charges]

int *arr;
//get size from user
arr = (int*)mallc(size*sizeof(int));

[weaknessforcats]

OK, but malloc just allocates memory and says nothing about the size of an array. The "arrayness" is in the pointer which may be typecast in varous ways.

Please read: http://bytes.com/topic/c/insights/77...rrays-revealed

and look at the last example.

You may also allocate arrays in C++ by using the new operator.