Reverse String Program In C

Dev Shed Forums Sponsor:

January 15th, 2013, 09:56 AM

avidwan

Registered User

Join Date: Jan 2013

Posts: 3

Time spent in forums: 43 m 14 sec
Reputation Power: 0

Reverse String Program In C

how can i reverse a string in c..? Please help me..

January 15th, 2013, 10:02 AM

salem

Contributed User

Join Date: Jun 2005

Posts: 3,835

Folding Points: 153 Folding Title: Novice Folder

Time spent in forums: 2 Months 3 Weeks 2 Days 15 h 19 m 43 sec
Reputation Power: 1774

You know, 6 posts in quick succession, each with NO EFFORT WHATSOEVER is a sure fire way of getting onto everyone's ignore list.

Given that your first post was "i have plan for develop a website for programming tutorials", it seems to me that you're just fishing for material.

__________________
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper

January 15th, 2013, 11:36 PM

zedeneye1

Contributing User

Join Date: Dec 2012

Posts: 52

Time spent in forums: 14 h 36 m 53 sec
Reputation Power: 1

very easy..

most programming books usually include example programs of such kind...

And I'm not sure, but maybe one of the standard libraries already does contain such a function...(I don't know all the string functions by heart, try googling)

January 15th, 2013, 11:37 PM

zedeneye1

Contributing User

Join Date: Dec 2012

Posts: 52

Time spent in forums: 14 h 36 m 53 sec
Reputation Power: 1

Quote:

Originally Posted by salem

You know, 6 posts in quick succession, each with NO EFFORT WHATSOEVER is a sure fire way of getting onto everyone's ignore list.

Given that your first post was "i have plan for develop a website for programming tutorials", it seems to me that you're just fishing for material.

and somehow managing to fail even at that lol...

January 16th, 2013, 06:26 AM

Sachin Bali

Registered User

Join Date: Dec 2012

Posts: 9

Time spent in forums: 1 h 42 m 30 sec
Reputation Power: 0

Quote:

Originally Posted by avidwan

how can i reverse a string in c..? Please help me..

#include <stdio.h>
void reverse_string(char[] arr);
void main()
{
char arr[30];
int i=0;
printf("Enter String of 6 character\t");
for(i=0;i<6;i++)
{
scanf("%c",&arr[i]);
}
print("Reverse of string is\n");
reverse_string(arr);
getch();
}
void reverse_string(char[] arr)
{
char arr2[30];
int i=0, j=0;
for(i=0,j=5;i<6;j--,i++)
{
arr2[i] = arr[j];
}
for(i=0;i<6;i++)
{
printf("%c",arr2[i]);
}
}

January 16th, 2013, 06:32 AM

swapy

Contributing User

Join Date: Feb 2010

Posts: 66

Time spent in forums: 14 h 4 m
Reputation Power: 0

You can simple use string reverse function strrev

Code:

#include<stdio.h>
#include<conio.h>
#include<string.h>
int main()
{
char str1[10]="Hello";

strrev(str1);

puts(str1);

getch();
return 0;
}

January 17th, 2013, 05:37 PM

BobS0327

Contributing User

Join Date: Oct 2012

Posts: 118

Time spent in forums: 3 Days 18 h 48 m 29 sec
Reputation Power: 44

Well, I offer the following as an example for your programming website

Code:

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

char* reverse_string(char* str)
{
	for(int beg = 0,  end = strlen(str) - 1; beg < end; ++beg, --end)
	{
		str[beg] ^= str[end];
		str[end] ^= str[beg];
		str[beg] ^= str[end];
	}
	return str;
}

int main(void)
{
	char buffer[]="Hello World";
	printf("%s\n", reverse_string(buffer));
	return 0;
}

Comments on this post

codergeek42 agrees: A clever use of XOR-swap algorithm.

January 17th, 2013, 07:53 PM

zedeneye1

Contributing User

Join Date: Dec 2012

Posts: 52

Time spent in forums: 14 h 36 m 53 sec
Reputation Power: 1

Quote:

Originally Posted by Sachin Bali

#include <stdio.h>
void reverse_string(char[] arr);
void main()
{
char arr[30];
int i=0;
printf("Enter String of 6 character\t");
for(i=0;i<6;i++)
{
scan("%c",&arr[i]);
}
print("Reverse of string is\n");
reverse_string(arr);
getch();
}
void reverse_string(char arr)
{
char arr2[30];
int i=0, j=0;
for(i=0,j=5;i<6;j--,i++)
{
arr2[i] = arr[j];
}
for(i=0;i<6;i++)
{
print("%c",arr2[i]);
}
}

are you making some mistakes or is that some other version of C where "scan" works instead of "scanf"...?

January 17th, 2013, 11:22 PM

Sachin Bali

Registered User

Join Date: Dec 2012

Posts: 9

Time spent in forums: 1 h 42 m 30 sec
Reputation Power: 0

Quote:

Originally Posted by zedeneye1

are you making some mistakes or is that some other version of C where "scan" works instead of "scanf"...?

By mistake. It should be "scanf" instead of "scan".

#10

January 17th, 2013, 11:34 PM

zedeneye1

Contributing User

Join Date: Dec 2012

Posts: 52

Time spent in forums: 14 h 36 m 53 sec
Reputation Power: 1

Quote:

Originally Posted by Sachin Bali

By mistake. It should be "scanf" instead of "scan".

and printf and several many other errors...

#11

January 17th, 2013, 11:37 PM

Sachin Bali

Registered User

Join Date: Dec 2012

Posts: 9

Time spent in forums: 1 h 42 m 30 sec
Reputation Power: 0

Quote:

Originally Posted by zedeneye1

and printf and several many other errors...

I already updated the code. Please check that first.

#12

January 18th, 2013, 03:23 AM

zedeneye1

Contributing User

Join Date: Dec 2012

Posts: 52

Time spent in forums: 14 h 36 m 53 sec
Reputation Power: 1

Quote:

Originally Posted by Sachin Bali

I already updated the code. Please check that first.

copy/paste the code in a compiler, there are still errors. I know cuz I checked. copy/pasted it in codeblocks and there's 5-6 errors, although the concept is clear. I can see what you did there...

#13

January 18th, 2013, 03:32 AM

Sachin Bali

Registered User

Join Date: Dec 2012

Posts: 9

Time spent in forums: 1 h 42 m 30 sec
Reputation Power: 0

Quote:

Originally Posted by zedeneye1

copy/paste the code in a compiler, there are still errors. I know cuz I checked. copy/pasted it in codeblocks and there's 5-6 errors, although the concept is clear. I can see what you did there...

Don't copy paste and execute the code. My work was to write algorithm and to clear the concept. Its the user responsibility to use it and to take care of the syntactical mistakes.

Don't take it as confirm code. Take it as a algorithm.