1. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
C++ CODES PART#13
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2. Using address operator & in pointers
#include<constream.h> void main() { clrscr(); int x=3; cout<<"\n\t the value of x is:"<<x;
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3. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Continue…..
cout<<"\n\n\t the address of x is :"<<(&x);
cout<<"\n\n\t the address of x is :"<<* (&x);
getch(); }
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4. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Output……
COPY ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT

5. The address –of operator &
#include<constream.h> void main() {clrscr(); int var1=11; int var2=22;
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6. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Continue…..
int var3=33;
cout<<&var1<<endl
<<&var2<<endl
<<&var3<<endl;
getch();}
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7. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Output…..
COPY ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT

8. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Pointer variables
#include<constream.h> void main() {clrscr(); int var1=11; //two integer varables int var2=22; cout<<&var1 <<endl // print address of variables
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9. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Continue…..
<<&var2<<endl<<endl;
int* ptr;//pointer to integers
ptr=&var1; //pointer points to var1
cout<<ptr<<endl; //print pointer value
ptr=&var2;//pointer points to var2
getch();}
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10. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Output…..
COPY ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT

11. Accessing the variable pointed to
#include<constream.h> void main() {clrscr(); int var1=11; //two integer varables int var2=22; int* ptr;//pointer to integers
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12. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Continue…..
ptr=&var1; //pointer points to var1
cout<<*ptr<<endl; //print contents of pointer(11)
ptr=&var2;//pointer points to var2
cout<<*ptr<<endl; //print contents of pointer(22)
getch();}
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13. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Output……
COPY ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT

14. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
USING POINTER TO ASSIGN A VALUE TO A VARIABLE AND THEN TO ASSIGN THAT VALUE TO ANOTHER VARIABLE
#include<constream.h> void main() {clrscr(); int var1,var2; //two integer variables int*ptr; //pointer to integers ptr=&var1; //set pointer to address of var1
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15. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Continue….
*ptr=37; //same as var1=37
var2=*ptr; //same as var2=var1
cout<<var2<<endl; //verify var2 is 37
getch();}
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16. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Output…..
COPY ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT

17. USER DEFINED FUNCTION WITH VOID
Sometimes void is used with user-defined function for the reason that the function should not return any value to the main function but to end the program after executing the user-define-functions body.
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18. Pointers by using user-define function with void
#include<constream.h> void display(int *a,int*b); void main() {clrscr(); int y,z; display(&y,&z); cout<<y<<z;
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19. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Continue….
getch(); } //user define function void display(int *a,int *b) { *a=100;
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20. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Continue….
*b=200;
cout<<a<<endl<<endl;
cout<<b; }
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21. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
Output……
COPY ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT

22. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
NICE WORDINGS….
Do not develop friendship with the enemy of your friend otherwise your friend will turn into an enemy.
Unfortunate is the one who cannot gain a few sincere friends during his life and more unfortunate is the one who has gained them and then lost them (Through his deeds)
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23. COPY RIGHT@ ENGR.SABA MUGHAL FROM COMPUTER SYSTEMS DEPARTMENT
NICE WORDINGS…..
A good teacher is like a candle - it consumes itself to light the way for others. 
Teaching is the profession that teaches all the other professions. 
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