All about Pointers
I am sure it will help a lot of students
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void main() { int a[5]; //creating an integer array to store upto 5 integers cout<<a; //output is the memory address of the element a[0] ie starting address of array //one way to access elements of array for(int i=0;i<5;i++) cout<<a[i]; //another way using pointers for(int i=0;i<5;i++) cout<<*(a+i); //*(a+i) is equivalent to a[i] }This was the case of static sized arrays ie size of the array is known at the compile time.
//this is okay const int size=5; //creating a constant variable int a[size]; //but this is wrong int size=5; int a[size];so to create dynamic arrays (eg when size has to be known from the user), we make use of pointers as-->
int size; int *a; //uninitialized pointer cout<<"Enter the size of the array: "; cin>>size; //got the array size from the user a=new int[size]; //a can now hold upto 'size' number of variables //now the elements of 'a' can be accessed in any of the 2 ways discussed above.Also there is a difference between int a=new int[size]; and int a=new int(size);