C-15

Lecture 15Lecture 15Version 1.0Version 1.0

Pointers and ArraysPointers and Arrays

2Rushdi Shams, Dept of CSE, KUET, Bangladesh

Passing Array Elements to Passing Array Elements to FunctionsFunctions

Array elements can be passed to a Array elements can be passed to a function by calling the function by function by calling the function by value, or by reference value, or by reference

In the call by value we pass values of In the call by value we pass values of array elements to the function array elements to the function

in the call by reference we pass in the call by reference we pass addresses of array elements to the addresses of array elements to the function function


Passing Array Elements to Passing Array Elements to Functions: Call by valueFunctions: Call by value


Passing Array Elements to Passing Array Elements to Functions: Call by referenceFunctions: Call by reference


Pointer ArithmeticPointer Arithmetic



Addition of a number to a pointer Addition of a number to a pointer



Subtraction of a number from a pointer Subtraction of a number from a pointer


What do we know so far?What do we know so far?

Array elements are always stored in Array elements are always stored in contiguous memory locations. contiguous memory locations.

A pointer when incremented always A pointer when incremented always points to an immediately next points to an immediately next location of its type. location of its type.


Pointers and ArraysPointers and Arrays


Pointer and ArrayPointer and Array

Our next two programs show ways in Our next two programs show ways in which we can access the elements of which we can access the elements of this array. this array.






Passing entire array to Passing entire array to functionfunction


Similar Statements!Similar Statements!


Array of PointersArray of Pointers

The way there can be an array of The way there can be an array of intints or an array of s or an array of floatfloats, similarly s, similarly there can be an array of pointers there can be an array of pointers

an array of pointers would be an array of pointers would be nothing but a collection of addresses nothing but a collection of addresses


Array of pointersArray of pointers


Array of pointersArray of pointers


Pointers to arrayPointers to array

An array of pointers can even contain An array of pointers can even contain the addresses of other arrays the addresses of other arrays

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C-15