letting user input number of elements in array
can a user input the number of elements in an array? this won't work:
^^note cliEls versus liEls.Code:int liEls; cout << "Elements in array liaArray[]="; cin >> liEls; const int cliEls=liEls; int liaArray[cliEls];
i'm trying to learn c++, thanks for your help!
Sure:
Code:int nArraySize = 0; cout << "How many items in the array? "; cin >> nArraySize; int *pnArray = (int *)calloc(nArraySize, sizeof(int)); // Use pnArray as a normal array... free(pnArray);
Did you see the sign on the door when you came in? This is a C++ forum.(int *)???
calloc() ???
free() ??
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First lesson: use simple, clear variable names. It appears that picking non-confusing variable names is not your strong suit at this point, so stick with single letters of the alphabet until you get the hang of it.^^note cliEls versus liEls.
i'm trying to learn c++
C++ allows you to dynamically create arrays at runtime. Here is how it is done:
Code:#include <iostream> #include <string> using namespace std; int main() { int s; cout<<"Enter the array size: "; cin>>s; string* ptr = new string[s]; for(int i = 0; i < s; i++) { cout<<"Enter some text: "; cin>>ptr[i]; } for(int j = 0; j< s; j++) { cout<<ptr[j]<<endl; } delete [] ptr; return 0; }
Last edited by 7stud; 05-22-2005 at 01:41 AM.
-_- I'm just stuck in the past. :P
calloc / free is C, this is C++
So
Did I mention I dislike hungarian notations?Code:int nArraySize = 0; cout << "How many items in the array? "; cin >> nArraySize; int *pnArray = new int[nArraySize]; // Use pnArray as a normal array... delete [] pnArray;
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
The "best" way to allocate an array based on user input is to use a vector:There is no need to cleanup (delete or free) the memory later, it will be cleaned up automatically like your original static array is.Code:int liEls; cout << "Elements in array liaArray[]="; cin >> liEls; std::vector<int> liaArray(liEls);
