Structure instance copying – Computer Sir Ki Class


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Structure instance copying

Copying one instance of structure to another for the instances derived from the same structure definition

Learning Objectives

  • Copying one object/instance based on any structure to another instance derived from the same structure.

Source Code

TC++ #2916


Source Code

Run Output

Details of Mobile 1
Screen = 1280x720, Price = 7000
Details of Mobile 2
Screen = 1280x720, Price = 8000

Code Understanding

struct Mobile { int screen_h; int screen_w; float price;};
A structure with three variables have been declared here.

Mobile m1,m2; //Two instances of structure named m1, m2 have been created.
m1.screen_h=1280; m1.screen_w=720; m1.price=7000;
Instance m1 has been filled with some data.

Instance m1 has been copied to instance m2 by using the assignment operator

Only one of the variable in instance m2 has been changed. Other two have been kept same to see the effect of copying.

cout<<“Details of Mobile 1″<<endl; cout<<“Screen = “<<m1.screen_h<<“x”<<m1.screen_w<<“, Price = “<<m1.price<<endl;
Data from instance m1 has been output.

cout<<“Details of Mobile 2″<<endl; cout<<“Screen = “<<m2.screen_h<<“x” <<m2.screen_w<<“, Price = “<<m2.price<<endl;
Data from instance m2 has been output. Since the copying occurred successfully thus two data items screen_h and screen_w are same as in instance m1. The last item price was modified only in the instance m2 so its change is appearing properly.



  • The copying can occur only when the derived instances are from the same definition of structure. It can not happen between instance derived from two structures even if there variable declarations are same.

Suggested Filename(s): strucopy.cpp


sunmitra| Created: 22-Jan-2018 | Updated: 22-Jan-2018|

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