![Pointers with Array
Pointers have close relationship with array. Pointers are linked with array
by taking its first element number and its base address. Suppose an array
of integer type, which is as defined as below:
Static int a[5] = {25, 30, 35, 40, 45}
Its can be represented in the computer memory as;
a(0) a(1) a(2) a(3) a(4)
Value address 25 30 35 40 45
1000 1002 1004 1006 1008](https://image.slidesharecdn.com/presentationofc1-170904174137/85/Presentation-of-c-1-7-320.jpg)
Presentation of c 1
- 1. Presentation of C Subject :- Pointers Submitted to:- Miss. Diya Sharma Submitted by :- Lovepreet (023) Grace (010)
- 2. Pointers Pointers are memory addresses variables i.e. the variables, which have addresses of the variables having some value, stored in the memory. It represented as : variable memory memory memory name value address variable q 280 6000 p (pointer)
- 3. Declaring a Pointer Variable (Initialization of Pointer): A pointer variable should be declared before they are used. If a variables going to hold a pointer, it must be declared as such. A pointer declaration consists of a base type, an * , and variable name. base type define data type………… its used in beginning of the main program. Syntax :- data-type *pointer-variable ; int *m; , float * y; , char * z; ……………….
- 4. Expressions An expression is a combination of operands and operators. It is a combination of two or more than two operands or many operators. Example:- a+b*c/d and so on………….
- 5. Pointers expression Pointers deals with the arithmetic, relational, logical and assignment expressions. Pointers are not directly used in the arithmetic, relational, logical and assignment expression, only pointer values are used. Some of the arithmetic expression used with pointer p1 and p2 as follow: Int x, y, *p1, *p2, z, a, b, c; x = 10; y = 20; p1 = &x; p2 = &y; Z = (*p1)/(*p2); a = (*p1)*(*p2); b = (*p1)+(*p2); c = (*p1)-(*p2);
- 6. Array Array is similar type of data collection name i.e. it is a collection of same data type elements. An array is a group of related data items, which share common name. “It is the set of homogenous data” a(0) a(1) a(3) a(4) or a{0., 1, 2, 3, 4}
- 7. Pointers with Array Pointers have close relationship with array. Pointers are linked with array by taking its first element number and its base address. Suppose an array of integer type, which is as defined as below: Static int a[5] = {25, 30, 35, 40, 45} Its can be represented in the computer memory as; a(0) a(1) a(2) a(3) a(4) Value address 25 30 35 40 45 1000 1002 1004 1006 1008
- 8. Pointers and Function: We can pass pointer to the function and also pointer addresses can be passed to the function as pointer arguments. This can be represented by two ways………….. A). Pointer as function argument B) Pointer to function
- 9. Pointer as function argument 1) Call by reference 2) call by value swapping: exchanging of value from one variable to another…….. ex = X and Y
- 10. Dynamic Memory Allocation In dynamic memory allocation of the memory, the declaration of variable is no longer required. The job of memory allocation can be done bye using the three functions…… 1) maclloc(): 2) calloc(): 3) realoc():
- 11. 1). maclloc(): syntax = viod*maclloc(unsigned size); 2). calloc(): syntax = void*calloc(xyz, unsigned size); 3). realloc(): syntax = viod*realloc(void*block, unsigned size);