programming in c pointers

_____is a variable that stores memory address of another variable which is of similar data type.

• node

• array

• pointer

• string

datatype *pointer_variable_name;

• array syntax

• string syntax

• pointer syntax

• c syntax

pointer arithmetic operations...?

• 1.Increment

  2.Decrement

  3.Addition

  4.Subtraction

• 1.multiplication

  2.division

  3.modular

• 1.Iogical AND

  2.logical OR

• any other

void main()

{

int a[5],sum=0,i,*ptr;

clrscr();

printf("\n Enter array elements:");

for(i=0;i<5;i++){

scanf("%d",&a[i]);

ptr=&a[0];

}

for(i=0;i<5;i++) {

sum=sum+(*ptr); ptr=ptr+1;

} printf("\n Sum= %d",sum);

getch();

}

ABOVE CODE IS OF.....?

• C program to sum of all elements stored in given array

• C program to sum of all elements

• C program to sum of all elements stored in given array using pointer

• C program to sum

datatype pointer_variable_name;

Eg: int ptr;

• Array

• Variable

• string

• pointer

void main() {

int x,y,a, b,*P1, P2;

x = 10; y = 20;

P1 = &x;

P2 = &y;

a = P1 * P2 +20;

b = P1 * *P2 – 20;

print f(“x=%d, y = %d”, x,y);

print f(“a=%d, b = %d”, a,b);

}

output for the above code is.....?

• Output: x=15, y=10a=20, b=80

• Output: x=20, y=10a=22, b=18

• Output: x=10, y=20a=220, b=180

• error

Explain meaning of following statements with reference to pointers

int a, b ; b = 20 ; a= b ; a = &b ;

• no idea

• int a,b; It is declaration of integer pointer a and integer variable b=20; value 20 is assigned to variable b. a=b; Value of b is assigned to pointer a. A=&b; Address of b is assigned to variable A.

• int a,b; It is declaration of pointer a and integer variable b b=20; value 20 is assigned to variable b. a=b; Value of b is assigned to pointer a. A=&b; Address of a is assigned to variable A.

• int a,b; It is declaration of integer pointer a and integer variable b b=20; value 20 is assigned to variable b. a=b; Value of b is assigned to pointer a. A=&b; Address of a is assigned to variable b.

Write the output of following c program

int main()

{

char *ptr; char str[]=”MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION”;

ptr=str;

ptr=ptr+11;

printf(“%s”, ++ptr);

return 0;

}

• compile time error

• TATE BOARD OF TECHNICAL EDUCATION

• STATE

  BOARD

  OF

  TECHNICAL EDUCATION

• error

what is the example of pointer?

• Int &amp;ptr;

• Int _ ptr;

• Int *ptr;

• Int %ptr;

What is a pointer...?

• variable which is of similar address .

• A pointer is a variable that stores memory address of another

  variable which is of similar data type.

• A pointer is a variable that stores memory address of another

• A pointer is a keyword that stores contiguous address of another

  variable which is of similar data type.