function

[sreedhanya]

how to write c program to reverse a string without using library function & without loop?

[Humayan]

try:

/****************************************************************

* File Name : c:programshelpshell.cpp

* Date : December,18,2007

* Comments : new project

* Compiler/Assembler :

* Program Shell Generated At: 3:35:40 p.m.

=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/

#include 

#include 

//#include 

//#include 

//#include 

//#include 

using namespace std;



//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ FUNCTION PROTOTYPES @@@@@@@@@@@@@@@@@@@@@@@@@@

void reverseString ( char * string , int length );

//##################################################################################



//main function ******************************

int main ( )

{

char string [ 13 ];

strcpy ( string , "hello theres" );

reverseString ( string , 12 );

cout << "reversed string: " << string << endl;



return 0 ;

}



/******************************* FUNCTION DEFINITION ******************************

Name : reverseString

Parameters :

string a(n) char * ( char * )



Returns: user defined type , void

Comments:



++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

void reverseString ( char * string , int length )

{

int i = length - 1;

int j = 0;

char temp;

while ( j <= i )

{

temp = string [ j ];

string [ j ] = string [ i ];

string [ i ] = temp;

j ++;

i --;

}

return;

}

[Humayan]

heres one without a loop:

/****************************************************************

* File Name : c:programshelpshell.cpp

* Date : December,19,2007

* Comments : new project

* Compiler/Assembler :

* Program Shell Generated At: 2:21:22 p.m.

=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/



#include < iostream >

//#include < string.h >

//#include < conio.h >

//#include < math.h >

//#include < iomanip >

//#include < ctype.h >

using namespace std;



//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ FUNCTION PROTOTYPES @@@@@@@@@@@@@@@@@@@@@@@@@@

void reverseString ( char * string , int & front , int & rear );

void reverseStringDriver ( char * string , int length );

//##################################################################################



//main function ******************************

int main ( )

{

char string [ 10 ] ;

strcpy ( string , "hellos" );

reverseStringDriver ( string , 6 );

cout << "reversed string : " << string << endl ;

return 0 ;

}

/******************************* FUNCTION DEFINITION ******************************

Name : reverseString

Parameters :

string a(n) char * ( char * )  ,

front a(n) int ( int )  ,

rear a(n) int ( int )

Returns: Void type

Comments:

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

void reverseString ( char * string , int & front , int & rear )

{



if ( front > rear )

return;

char temp;



temp = string [ front ];

string [ front ] = string [ rear ];

string [ rear ] = temp;



front ++;

rear --;

return;

}

/******************************* FUNCTION DEFINITION ******************************

Name : reverseStringDriver

Parameters :

string a(n) char *



Returns: Void type

Comments:



++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

void reverseStringDriver ( char * string , int length )

{

int front = 0 , rear = length - 1;

reverseString ( string , front , rear );

return;

}

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