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Question :
How can you get the number of elements in an array allocated dynamically at runtime?
For example -
int *p = (int *) malloc(sizeof(int) * n);

int numElems = ??????? /* n is not available here */



Category C Interview Questions
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Added on 7/19/2006
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Answers:

To get the numElements in a situation where we don't know the n following logic will work.

1. First get the total size of array. i.e. X = sizeof(p) * n

2. Now divide the X with size of each element. numElements = X/sizeof(int).





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