Reverse a string without using library function

[sreedhanya]

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

[Humayan]

Try

C

/**************************************************************** * File Name : c:programshelpshell.cpp * Date : December,18,2007 * Comments : new project * Compiler/Assembler : * Program Shell Generated At: 3:35:40 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 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; }

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/**************************************************************** * File Name : c:programshelpshell.cpp * Date : December,18,2007 * Comments : new project * Compiler/Assembler : * Program Shell Generated At: 3:35:40 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 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; }

 

• This reply was modified 10 years ago by M. Saqib.
• This reply was modified 2 years, 3 months ago by M. Saqib.
• This reply was modified 2 years, 3 months ago by M. Saqib.
• This reply was modified 2 years, 3 months ago by M. Saqib.

[Humayan]

Here’s one without a loop:

C++

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