string interview questions in c -3

Question 3.Write a program to swap elements of array of pointers to strings ?

Ans :

#include 

#include 

#include 



#define MAX 6



char *names[MAX] ;

int count ;



int add ( char * ) ;

void swap ( int, int ) ;

void show( ) ;



void main( )

{

	int flag ;



	clrscr( ) ;



	flag = add ( "akshay" ) ;

	if ( flag == 0 )

		printf ( "Unable to add string" ) ;



	flag = add ( "parag" ) ;

	if ( flag == 0 )

		printf ( "Unable to add string" ) ;



	flag = add ( "raman" ) ;

	if ( flag == 0 )

		printf ( "Unable to add string" ) ;



	flag = add ( "srinivas" ) ;

	if ( flag == 0 )

		printf ( "Unable to add string" ) ;



	flag = add ( "gopal" ) ;

	if ( flag == 0 )

		printf ( "Unable to add string" ) ;



	flag = add ( "rajesh" ) ;

	if ( flag == 0 )

		printf ( "Unable to add string" ) ;

	printf ( "\nNames before swapping:\n" ) ;

	show ( ) ;



	swap ( 2, 3 ) ;

	printf ( "\nNames after swapping:\n" ) ;

	show ( ) ;



	getch( ) ;

}



/* adds given string */

int add ( char *s )

{

	if ( count < MAX )

	{

		names[count] = s ;

		count++ ;

		return 1 ;

	}

	else

		return 0 ;

}



/* swaps the names at given two positions */

void swap ( int i, int j )

{

	char *temp ;

	temp = names[i] ;

	names[i] = names[j] ;

	names[j] = temp ;

}



/* displays the elements */

void show ( )

{

	int i ;

	for ( i = 0 ; i < count ; i++ )

		puts ( names[i] ) ;

}