Array of C structs

Question

If I create a struct in C and want to add them to an array that is not set to a fixed size, how is the array created?

Can one create a tempStruct which is used on ev

Answer 1

When the size is unknown at compile time, you'll need to allocate the memory on the heap, rather than in the data segment (where global variables are stored) or on the stack (where function parameters and local variables are stored). In C, you can do this by calling functions like malloc.

MyStructType *myArray = (MyStructType *)malloc(numElements * sizeof(MyStructType)
... do something ...
free(myArray)

If you're actully using C++, it's generally better to use new[] and delete[], e.g.

MyStructType *myArray = new MyStructType[numElements]
... do something ...
delete [] myArray

Note that new[] must be paired with delete[]. If you're allocating a single instance, use new and delete (without "[]"). delete[] and delete are not equivalent.

Also, if you're using C++, it's generally easier and safer to use an STL vector.