Write a C program to reverse the string without using strrev() function?

dilipiyer
Profile Answers by dilipiyer

Jan 29th, 2006

#include<stdio.h>
#include<string.h>
main()
{
char str[50],revstr[50];
int i=0,j=0;
printf("Enter the string to be reversed : ");
scanf("%s",str);
for(i=strlen(str)-1;i>=0;i--)
{
revstr[j]=str[i];
j++;
}
revstr[j]='\0';
printf("Input String : %s",str);
printf("\nOutput String : %s",revstr);
getch();
}

Rohan
Profile Answers by Rohan

Feb 11th, 2006

#include <stdio.h>
#include <conio.h>
#include <string.h>
void main()
{
   char str[10],temp;
   int i,len;
   printf("Enter String : ");
   scanf("%s",str);
   len=strlen(str)-1;
   for(i=0;i<strlen(str)/2;i++)
   {
      temp=str[i];
      str[i]=str[len];
      str[len--]=temp;
   }
   printf("%s",str);
   getch();
}

Rohan
Profile Answers by Rohan

Feb 18th, 2006

#include <stdio.h>
#include <conio.h>
#include <string.h>
void main()
{
   char *str;
   int i,len;
//not using any temp variable and assume we can use only string array and   length
   printf("Enter String : ");
   scanf("%s",str);
   len=strlen(str)-1;
   for(i=0;i<strlen(str)/2;i++)
   {
         str[i]+=str[len];
        str[len]=str[i]-str[len];
         str[i]=str[i]-str[len--];
   }
   printf("Reverse String is : %s",str);
   getch();
}

umashankar

Mar 14th, 2006

Can u pls guide me to reverse a string using recursion without using assignment operator.Thanking Uma

umaira

Apr 17th, 2006

can u send me the program to reverse a string using recursion.And the input should be a list of characters i.e not getting the input as string.

Venkatesh

May 13th, 2006

How to write a c program to reverse the string with in the same string? I.e No other string variables should be used. Not even built functions also.

Syed Aftab

Jul 4th, 2006

program to reverse a string using recursive function:
---------------------------------------------------
void reverse (int index, char *str ) ;
int main (void)
{
   char name[100];
   printf ("Enter a mutli-word string") ;
   gets(name) ;
   reverse (strlen(name) , name ) ;
}
void reverse (int index, char *str )
{
if (--index < 0 )
{
     return ;
}
else
{
        putchar ( *(str + index) ) ;
       reverse (index, str) ;
}
}
Logic:
-----
For eg : let's say the user has entered 50 characters.
then index is initially 50.
when reverse() function is called for the first time then
index will be 50 .we first decrement the index by 1 so that
it will become 49 and i am printing the 49th character i.e last
character in the string then reverse() function is called again
with index as 49 and str pointing to 49th character and again
the index will be decremented by 1 so that it will become 48 this
will continue until zeroth index is reached.
i hope this will solve the problem that you have reported , for any
queries you can mail me.
Regards,
Syed

neha

Jul 29th, 2006

#include<stdio.h>
int main()
{
char c;
c=getchar();

if(c!='.') //dot is to terminate when u r finished given the string char by char/

main();//calling main recursively

putchar(c);
return 0;
}

BHARADWAJ

Aug 13th, 2006

Excellent code, Please give the solution for this RE: Write a C program to reverse the string by taking single char i.e by putting each time to that char

Gary

Sep 23rd, 2006

not really a C programmer.pseudocode:String reverse(str){ if(str.length == 1){ return str; }else{ return(reverse(secondHalfOfString) + reverse(firstHalfOfString)) }}

sajag

Oct 11th, 2006

void ret_str(char* s){ if(*s != '') ret_str(s+1); cout<<*(s);}int main(){ ret_str("born2c0de"); return 0;}~

varun51

Oct 14th, 2006

I have written this code:

#include <stdio.h>
void rev_str(char* s)
{

if(*s != '')
rev_str(s+1);

printf("%c",*s);
}

int main()
{
rev_str("born2c0de");
return 0;
}

Here i am able to reverse the string and print it out...but i want rev_str function to return the reversed string or ideally reverse the passed string itself.

Can you help me out?

venkataramana

Oct 17th, 2006

this is the program to revers the string without using string functions.
main()
{
int i,k,t,j;
char s1[20],s2[20];
printf("enter the stringn");
gets(s);
for(i=0;s[i]!='';i++)
{
j++;
}
t=0;
for(k=j;k>=0;k--)
{
s2[t]=s1[k];
t++;
};
s2[t]='';
printf("%s",s2);
}

Jurgen Grech

Dec 17th, 2006

#includeint main(){char c;c=getchar();if(c!='.') //dot is to terminate when u r finished given the string char by char/{ main();//calling main recursivelyputchar(c); }return 0;}

Vinayak S S

Jul 4th, 2007

1. Write a function to reverse string.
int main()
{
char a[10] = "mysore" ;
char b[10];
strrev(a , b);
printf("%s",b); //should print "erosym"
}

2. Write a function to capitalize first letter of every word
in string.
int main()
{
char a[50] = "mysore karnataka india" ;
char b[50];
Capitalize(a , b);
printf("%s",b); //should print "Mysore Karnataka India"
}

3. Write a function to reverse the words in string.
int main()
{
char a[50] = "mysore karnataka india" ;
char b[50];
reversewords(a , b);
printf("%s",b); //should print "india karnataka mysore"
}

soorajsk_84
Profile Answers by soorajsk_84 Questions by soorajsk_84

Jul 4th, 2007

void main()
{
            char str1[20],strev[20]
            int *i=str1;
            int *j=strev;
              printf("Enter the srting");
              scanf("%s",str1);

  while(*i!= '')
   {
    i++;
   }
                while(i>=&str[0])
                 {
                         *j++=*i--;

                 }
*j='';
printf("nthe rev string %s",strev);
}

akshatha

Oct 28th, 2007

Can you write this without using string lib function but with pointers

chibionos
Profile Answers by chibionos

Dec 13th, 2007

The Solution
/*
Name: String Reverse Function
Copyright: None
Author: Chibionos a.k.a Chibi Chakaravarthi
Date: 13-12-07 08:37
Description: A Simple program to reverse a given string with the help
               of a function and return the reversed string to the program
               PS: No string manipulation headers and only one string variable
               used.
*/

#include <stdio.h>
#include <iostream.h>
#include <conio.h>

char* StringReverse(char *str1)
{
      // Create a String in the Function to Accomodate the
      // Incoming String as there is no reserved space for
      // Function parameters.

      char *str;
      str = (char *)malloc(sizeof(str1));
      strcpy(str,str1);


      // To get the length of the String.
      int iLength;
      char cTemp;

      for(iLength=0;*(str+iLength)!='';iLength++);

      /*/ Concept : One index starts from the First and the other starts
                    at the end and the characters are interchanged leaving
                    the middle charater when there is odd number of characters
                    and when even number of characters are present no special
                    case is encountered.
      /*/
      for(int i=0,j=iLength-1;i<=j;i++,j--)
              {

              // Code to Exchange the Characters
                      cTemp = *(str+j);
                      *(str+j) = *(str+i);
                      *(str+i) = cTemp;

              }

      return str;
}

main()
{
      cout<<StringReverse("abcdefghi");
      getch();
}

raghu.neo
Profile Answers by raghu.neo

Mar 2nd, 2008

Love your code neha.. nice way of thinking...

amarendra.moharana
Profile Answers by amarendra.moharana Questions by amarendra.moharana

Mar 12th, 2008

Hi Rohan,
Can you explain the logic that you write in the above, Reverse of
the string without using temp variable?

str[i]+=str[len];
str[len]=str[i]-str[len];
str[i]=str[i]-str[len]--;

How we can add and subtract a character from other character?

Please
clear me the logic that you explained above?

Regards
Amarendra
moharana.amarendra @ gmail . com

yusufharoon84
Profile Answers by yusufharoon84

Jun 16th, 2008

Below are part of the program that I've done so far.

#include
#include

main()
{
char s1[10];
char s2[10];
char s3[10];
int num;

printf("Enter Original String: ");
scanf("%s",s1);
printf("1) Reverse Stringn");
printf("2) Join Reverse Stringn");
printf("3) Insert Reverse Stringn");
printf("4) Encrypt Stringn");
printf("5) Find Total ASCII Valuen");
printf("Enter Choice:");
scanf("%d",&num);
switch(num){
case 1: strcpy(s2,s1);
strrev(s2)
printf("Result: %s",s2);
break;

case 2: strcpy(s2,s1);
strrev(s2);
printf("Result: %s",strcat(s1,s2));
break;

case 3: strcpy(s2,s1);
strrev(s2);
printf("Result: %s",strcat(s1+1,s2+1));
break;

case 4:
int num2;
printf("Enter Number:");
scanf("%d",&num2);
printf("Result: %s",
break;

case 5:
printf("Result: %s",
break;
}
}

Genesis7
Profile Answers by Genesis7

Dec 24th, 2008

# include <stdio.h>
# include <conio.h>
# include <string.h>

void main ()
{
   char word[20];
   int i;

   printf ("Enter Your Name: ");
   scanf ("%s",word);

   i = strlen(word)-1;

   while (i >= 0)
   {
    printf ("%c",word[i]);
      i--;
   }
   getch();
}

madhavi.prathapaneni
Profile Answers by madhavi.prathapaneni

Mar 4th, 2009

#include<stdio.h>

int main()
{
           char ch,str[20];
           int i,j;

           printf("Enter The string to be revresedn");
           gets(str);

           for(j=0;s[j]!='';j++)
           {
           }
           j--;

           for(i=0;i<j;i++)
           {
                 ch = s[i];
                 s[i]=s[j];
                 s[j]=ch;

                 j--;
            }

           printf("The Reversed string is %sn",str);

            return 0;
}

Rajippp
Profile Answers by Rajippp

Jun 11th, 2009

#include <stdio.h>
#include <conio.h>
#include <string.h>
void main()
{
   char str[10],temp;
   int i,len;
   printf("Enter String : ");
   scanf("%s",str);
   len=strlen(str)-1;
   for(i=0;i<strlen(str)/2;i++)
   {
      temp=str[i];
      str[i]=str[len];
      str[len--]=temp;
   }
   printf("%s",str);
   getch();
}

Aparana Gupta
Profile Answers by Aparana Gupta

Sep 23rd, 2009

#include<stdio.h>
void main(){
int i;
char temp;
char str[9] = "Computer";
int length;
length = strlen(str1)-1;
printf("The length of the String is: %dn",length);
for(i=0;i<length;i++){
temp = str[i];
str[i]=str[length];
str[length]=str[i--];
}
printf("The Reversed string is: %sn", str);
getch();
}

ANJI

Aug 17th, 2011

#include
#include
int main()
{
char str[50],revstr[50];
int i=0,j=0;
printf("Enter the string to be reversed : ");
scanf("%s",str);
for(i=strlen(str)-1;i>=0;i--)
{
revstr[j]=str[i];
j++;
}
revstr[j]='�';
printf("Input String : %s",str);
printf("
Output String : %s",revstr);
return 0;
}

preparing

Sep 8th, 2011

Can anyone explain this piece of code to me ??

Code
void reverse(char *str) {


2 char * end = str;


3 char tmp;


4 if (str) {


5 while (*end) {


6 ++end;


7 }


8 --end;


9 while (str < end) {


10 tmp = *str;


11 *str++ = *end;


12 *end-- = tmp;


13 }


14 }


15 }

chaitu

Sep 21st, 2011

Where did the variable initialize . Which is used in the program for 2 times

Sharath

Sep 22nd, 2011

Pre>
Code
#include<stdio.h>

#include<conio.h>

#include<string.h>

int main()

{

int i;

char a[10];

printf("Enter a string:");

scanf("%s",&a);

for(i=strlen(a)-1;i>=0;i--)

{

printf("%c",a[i]);

}

getch();

return 0;

}

praneeth

Oct 9th, 2011

Without using any sting manipulation functions.

Code
char* str_reverse(const char *in_str)


{


        char *out_str;


        out_str = (char *)malloc(sizeof(in_str));


        int char_pos=0;


        int str_len=0;


        while(*in_str!='')


        {


                in_str++;


                char_pos++;


        }


        in_str--;


        str_len = char_pos;


        while(char_pos >0)


        {


                *out_str=*in_str;


                in_str--;


                char_pos--;


                out_str++;


        }


        *out_str='';


        while(str_len>0)


        {


                out_str--;


                str_len--;


        }


        return out_str;


}

SANDEEP

Oct 11th, 2011

Code
#include<stdio.h>


#include<string.h>


main()


{


        int l,i;


        char s[100],*sp;


        printf("Enter a string:");gets(s);


        l=strlen(s);


        sp=(s+l);


        for(i=0;i<l;i++,sp--)


                printf("%c",*sp);


        printf("


");


        


}

sudhir madi

Oct 17th, 2011

#include
#include
reverse(char str[]);
main()
char str[10];
printf("Enter the string to reverse - ");
scanf("%s",str);/*Read contents of string*/
reverse(str);/*Function call by using str */
return 0;
}
reverse(char str[10]) /*Function to reverse string*/
int i,j;
char c;
j=0;
while (str[j]!='�') /* Total count of characters*/
j++;
j--;/*Exact count including Array index 0, reduce total count by 1*/
for(i=0;i<=j;
i++) /*Character-by-character reversing*/
c=str[j];
str[j]=str[i];
str[i]=c;
j--;
}
printf("
The reverse of given string - %s
", str);/*Display the reverse of string*/
}

#include
#include
reverse(char str[]);
main()
{
char str[10];
printf("Enter the string to reverse - ");
scanf("%s",str);/*Read contents of string*/
reverse(str);/*Function call by using str */
return 0;
}
reverse(char str[10]) /*Function to reverse string*/
{
int i,j;
char c;
j=0;
while (str[j]!='�') /* Total count of characters*/
j++;
j--;/*Exact count including Array index 0, reduce total count by 1*/
for(i=0;i<=j;i++) /*Character-by-character reversing*/
{

c=str[j];
str[j]=str[i];
str[i]=c;
j--;
}
printf("The reverse of given string - %s
", str); /*Display the reverse of string*/
}

Chandrabhan

Dec 26th, 2011

Code
//String Reverse without using strrev function


#include"stdio.h"


#include"conio.h"


#include"string.h"


void main()


{


 char str1[20],str2[20];


 int i,j=0;


 clrscr();


 printf("***********String Reverse*********


");


 printf("Enter String:");


 gets(str1);


 for(i=strlen(str1)-1;i>=0;i--,j++)


 {


  str2[j]=str1[i];


 }


 str2[j]=NULL;


 printf("


Reverse String is:");


 puts(str2);


 getch();


}

indhu

Feb 7th, 2012

Code
#include <stdio.h>


void main()


{


char a[50];


int b=0,i=0;


printf("Enter the String


");


scanf("%s",a);


b=strlen(a);


for(i=b;i>=0;i--)


{printf("%c",a[i]);


}getch();


}

rajkumar verma

May 13th, 2012

Without using strlen and strrev functions.....

Code
{geshibot language="c"}


#include


#define MAX 500


int main()


{


    char v[MAX];


    char r[MAX];


    static int i=0,d=0;


    int j;


    printf("Enter string to be reversed :


");


    gets(v);


    while(v[i]!=)


    {


                     i++;


    }


    for(j=i;j>0;j--)


    {


                     r[j-1]=v[d];


                     d++;


    }


    r[i]=;


    printf("


");


    printf("Reversed string : 


");


    puts(r);


    return 0;


}

ankur

Jun 18th, 2012

Code
#include


#define MAX 500


int main()


{


char v[MAX];


char r[MAX];


static int i=0,d=0;


int j;


printf("Enter string to be reversed :


 


");


gets(v);


   while(v[i]!=)


        {


        i++;


        }


        for(j=i;j>0;j--)


        {


        r[j-1]=v[d];


        d++;


        }


 


r[i]=;


printf("");


printf("Reversed string :");


puts(r);


return 0;


}

Munish Katoch

Oct 10th, 2012

Code
char* revString(char *input) {


        int i,j;


        if(input == NULL)


                return NULL;


                


        


        for(i = strlen(input)-1,j=0; j <= ((strlen(input)-1)/2);i--,j++){


        


                char temp = input[j];


                input[j] = input[i];


                input[i] = temp;


                //printf("%s 


",input);


        }


        


        return input;


}

Gabriel

Oct 23rd, 2012

Using bitwise operators

Code
void ReverseString(char* pszBuff)


{


  int iLen = strlen(pszBuff);


  for (int i = 0; i < (iLen / 2); ++i)


  {


    char aux = *(pszBuff + i) ^ *(pszBuff + iLen - 1 - i);


    *(pszBuff + iLen - 1 - i) ^= aux;


    *(pszBuff + i) ^= aux;


  }


}

M.AKHIL

Jan 21st, 2013

Code
#include <stdio.h>


#include <conio.h>


#include <string.h>


void main()


{


   char *str;


   int i,len;


 


  //not using any temp variable and assume we can use only string array and   length


 


   printf("Enter String : ");


   scanf("%s",str);


   len=strlen(str)-1;


   for(i=0;i<strlen(str)/2;i++)


   {


         str[i]+=str[len];


         str[len]=str[i]-str[len];


         str[i]=str[i]-str[len--];


   }


   printf("Reverse String is : %s",str);


   getch();


}

kanwal

Jan 29th, 2013

#include
#include
#include

void main()
{
char string1[20],string2[20];
int i,j,length;
printf("
Enter the string : ");
gets(string1);
length=strlen(string1);
j=length;
printf ("%d",j);
for(i=0;i {

string2[i]=string1[j-1];
j--;

}
string2[i] = ;
printf("
Reversed string is : %s",string2);
getch();
}

Code
#include<stdio.h> 


#include<conio.h> 


#include<string.h>


 


void main() 


{ 


char string1[20],string2[20]; 


int i,j,length; 


printf("


Enter the string : "); 


gets(string1); 


length=strlen(string1);


j=length;


printf ("%d",j);


        for(i=0;i<length;i++) 


        { 


        


                string2[i]=string1[j-1];


                        j--;


 


        } 


        string2[i] = ;


printf("


Reversed string is : %s",string2);


getch(); 


}

sunny

Apr 25th, 2013

it is asking for prototype ..???

Ankur Verma

May 18th, 2013

Code
 


#include <stdio.h> 


#include <string.h>   


void main() 


{  


int len=0,i=0;  


char s[16]="virendra";       


while (*(s+len) !=)


{    


len++; 


}  


printf("%d",len);      


for (i=0;i<=(len)/2;


i++)


{      


printf("  i:


%d len:%d and s[i]:


%c s[len-1]:%c",i,len-1,s[i],s[len-1]);           s[i]+=s[len-1];     


s[len-1]=s[i]-s[len-1];     


s[i]-=s[len-1];            


len--;  


}  


printf(" ");  


puts(s); 


}

Himasnhu Pandey
Profile Answers by Himasnhu Pandey

Jan 4th, 2015

Code
#include<stdio.h>


#include<stdlib.h>


int main()


{


        char s[20];


        int len;


        gets(s);


        len=strlen(s)-1;


        while(len>0)


        {


          printf(" %c ",s[len]);


          len--;


        }


        printf("


");


 


}

maryam amjad

Mar 15th, 2015

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reply

Code
#include<stdio.h>


#include<string.h>


 


int main() {


   char str[100], temp;


   int i, j = 0;


 


   printf("


Enter the string :");


   gets(str);


 


   i = 0;


   j = strlen(str) - 1;


 


   while (i < j) {


      temp = str[i];


      str[i] = str[j];


      str[j] = temp;


      i++;


      j--;


   }


 


   printf("


Reverse string is :%s", str);


   return (0);


}

Manoj

Aug 9th, 2015

Code
#include<stdio.h><br />


#include<string.h><br />


int main(){<br />


char str[100],a[100];<br />


int i,len;<br />


scanf("%s",str);<br />


len=strlen(str);<br />


for(i=len-1;i>=0;i--){<br />


    a[len-i-1]=str[i];<br />


}<br />


a[len]=;<br />


    printf("%s",a);<br />


return 0;<br />


}<br />

nandan

Nov 9th, 2015

strlen is a library function.

Upanya

Nov 25th, 2015

Code
#include <iostream>


#include <algorithm>


using namespace std;


 


int main() 


{


     string str = "yourstring";


     reverse(str.begin(),str.end()); 


      cout<<str;


 


return 0;


}

Upanya

Nov 25th, 2015

# in python, same can be done this way
string = "yourstring"
string = string[::-1]
print string

rahul bhandari

Jul 5th, 2016

Solution - Using array revers string for best approached in code.

Code
#include<stdio.h>


#include<string.h>


int main()


{       char s[200];


        int i,j,n;


        gets(s);


        n=strlen(s);    j=n-1;  for(i=0;i<n;i++)


        {       while(i<j)


                {


                        s[j]=s[i];      i++;            j--;    }


        }       printf("%s",s);


return 0;


}

Sachchidanand Tiwari

Oct 19th, 2016

Code
#include<stdio.h>


#include<conio.h>


#include<string.h>


int main()


{


        int l;


        char data[100];


        printf("


                                         Enter an string ::");


        gets(data);


        l= strlen(data);


        


        printf("


 


 


                                 Reverse string ::


 


 


");


        while(l>=0)


        {


                printf("%c",data[l]);


                l--;


        }


        getch();


        return 0;


        


}

Gurjyot Singh

Dec 5th, 2016

Here`s the answer

Code
#include<stdio.h>


#include<conio.h>


#include<string.h>


int main()


{


        char A[20];


        int i;int C=0;


        printf("Enter String : 


");


        gets(A);


        for(i=0;A[i]!=;i++)


        {


                C++;


        }


        for(A[C]=;C>=0;C--)


        {


                printf("%c",A[C]);


        }


 


        getch();


        return 0;


}

naveen

Jun 17th, 2017

Code
#include<stdio.h>


#include<conio.h>


#include<string.h>


 


void main()


{


char str[10],temp;


int i,len;


printf("enter string: ");


scanf("%s",str);


len=strlen(str)-1;


for(i=0;i<strlen(str)/2;i++)


{


temp=str[i];


str[i]=str[len];


str[len--]=temp;


}


printf("reverse string : %s" ,str);


getch();


}

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Write a C program to reverse the string without using strrev() function?

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