Function arguments as pointer reference – Output writing – Computer Sir Ki Class


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Exam Questions-CBSE12A-2019-A01D #CPP#6953    siteicon   siteicon  

Problem Statement - Function arguments as pointer reference – Output writing

Find and write the output of the following C++ program code:

Note: Assume all required header files are already included in the program.

void Alter(char *S1, char *S2)
  char *T;
void main()
  charX[]="First", Y[]="Second";



TC++ #6953


Run Output



This is how it works:
char X[]=”First”, Y[]=”Second”; //Two character array are initialised with First and Second
Alter(X,Y);                                      //This transfers location of first member of X and first member of Y

void Alter(char *S1, char *S2)    //Here it enters function using pointer types as they are just location addresses
char *T;   //A char pointer type is declared
T=S1; S1=S2; S2=T; //This is typical pointer swapping technique using temporary pointer T
cout<<S1<<“&”<<S2<<endl; //Here Second&First is displayed as values are read from alternative locations due to swapping
S1 is actually being read from where S2 was there previously and vice-versa. remember content actually remains at their original
positions only. With no instruction content has been moved or copied.

This is output line back in main routine. Since the actual content is at there respective positions only so This will display
First*Second   only

Common Errors

  • Here learners may find it difficult to absorb the concept as only reading of pointers have been changed and content has not been changed.


CSKC| Created: 8-Apr-2019 | Updated: 22-Feb-2020|CBSE12A-2019

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