When dynamic memory allocation is used extensively, memory leak may occur.It happens when first memory block is not deleted . However, the address is lost because the pointer contains the address of second block.The memory leak is unintentional occupied memory. It can de avoided by using delete statement.

example:

float *ptr=new float

*ptr=6.0;//Access first block

'Use delete statement --"delete ptr";Otherwise it will cause memory leak

ptr=new float

*ptr=7.0//Acess second block