Reverse A String

**raju01** · 01-02-2006

I Want Programe Of Reverse A String

**vaibhav** · 01-02-2006

Use standard function strrev defined in string.h

Code:

Prototype
char*strrev(char*)

Use it like

Code:

char orignalstring[]="Happy",revstring[50];
revstring=strrev(orignalstring);

[/code]

**kermit** · 01-02-2006

Originally Posted by vaibhav

Use standard function strrev defined in string.h

Code:

Prototype
char*strrev(char*)

Use it like

Code:

char orignalstring[]="Happy",revstring[50];
revstring=strrev(orignalstring);

[/code]

Nope, it is not a standard function.

@the OP, do a board search on 'reverse a string' - this comes up often.

**Salem** · 01-02-2006

Not to mention
http://cboard.cprogramming.com/annou...ouncementid=39

And not to mention how Writing In Initial Caps Really Sucks
http://www.catb.org/~esr/faqs/smart-questions.html

> I Want Programe Of Reverse A String
Did Yoda translate that into English for you?
Program reverse a string not will I give you - mmmmm

**Dark~Cloud** · 01-02-2006

That was cruel...
It's a good thing I came accross this thread, I was wanting to learn this. Once again, you guys have been very useful and I've just found this site.

**Dave_Sinkula** · 01-02-2006

Stick around for a couple years answering these questions and find out that the advice given was not harsh. Or if you are a masochist, post a question on comp.lang.c.

Read the guidelines: show an attempt and there are those with plenty of experience that will correct all of the flaws, well beyond things you will even imagine for some time. Ignore the rules, and you will be treated like a freeloader. Quid pro quo.

**Dark~Cloud** · 01-02-2006

That was...interesting...?

**=viki=** · 01-02-2006

hey try this .. im also new here but i think the porb is small so i can give u my prog toreverse a strng,,

Code:

#include<stdio.h>
char rev[20];
void reverse(char *x)
{
	int i=0,j=0;
	while(x[i]!='\0')
		i++;
	i--;
	while(i>=0)
	{
		rev[j]=x[i];
		j++;
		i--;
	}
	rev[j]='\0';
}
void main()
{
	char str[20];
	printf("enter the strning to be reversed : ");
	scanf("%s",str);
	reverse(str);
	printf("\n\nreversed sring is : %s",rev);
}

any comments welcome.....

**xhi** · 01-02-2006

wow..

somtimes people can just amaze you.. over and over

**=viki=** · 01-03-2006

what was that????????

**major_small** · 01-03-2006

you've never heard of a swap function?

in this case it would almost literally cut your time in half:

Code:

#include <iostream>

int main()
{
	char swap;
	char line[]="RaceCar";
	short int i=0;
	short int x=6;

	for(;i<x;i++,x--)
	{
		swap=line[i];
		line[i]=line[x];
		line[x]=swap;
	}

	std::cout<<line<<std::endl;
	return 0;
}

and yes, I know it's C++ on a C board, but all you need to pay attention to is that for loop

**Salem** · 01-03-2006

> any comments welcome.....
You used void main - main always returns an int - see previous posts and the FAQ
You used a global variable
You limited the length to only 20 characters
You didn't check for input overflows

**tqh831213** · 01-03-2006

Originally Posted by =viki=

hey try this .. im also new here but i think the porb is small so i can give u my prog toreverse a strng,,

Code:

#include<stdio.h>
char rev[20];
void reverse(char *x)
{
	int i=0,j=0;
	while(x[i]!='\0')
		i++;
	i--;
	while(i>=0)
	{
		rev[j]=x[i];
		j++;
		i--;
	}
	rev[j]='\0';
}
void main()
{
	char str[20];
	printf("enter the strning to be reversed : ");
	scanf("%s",str);
	reverse(str);
	printf("\n\nreversed sring is : %s",rev);
}

any comments welcome.....

there may some error above.

Code:

void reverse(char *x)
{
	int i=0,j=0,z=0;
	while(x[i]!='\0')
		i++;
	rev[i--]='\0';
	z=i/2;	//or z=i>>1;
	for(;z;z--)
	{
		rev[j]=x[i];
		j++;
		i--;
	}
}

**treenef** · 01-03-2006

Here are some better swap functions...

tongue in cheek

Code:

void swap(int &x, int &y)
{
    x -= y;
    y += x;         // y gets the original value of x
    x = (y - x);    // x gets the original value of y
}

void swap2(int &x, int &y)
{
	x ^= y ^= x ^= y;
}

**Dave_Sinkula** · 01-03-2006

Originally Posted by treenef

Here are some better swap functions...

Thanks, I needed a chuckle.

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