how Reverse string c

Question

1.00/5 (3 votes)

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hello i want Reverse string in c just using (string.h :(strcat and strcpy and strcmp))
without (poniter and strrev )
sorry for my english
I want these non- answer

C++

#include <stdio.h>
#include <stdlib.h>
#include<string.h>
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) ;
  }
}

Posted 16-Nov-14 5:37am

Mortadda jafar

Updated 17-Nov-14 7:42am

v5

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Comments

Sergey Alexandrovich Kryukov 16-Nov-14 11:44am

Maybe, "reverse", or something else? Without pointer and array?! Your teacher is probably too clever. :-)
—SA

OriginalGriff 16-Nov-14 11:51am

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind.
Use the "Improve question" widget to edit your question and provide better information.

4 solutions

Solution 2

Is this fulfilling your constraints?

C

size_t pos = strlen(name);
while(pos > 0) putchar(name[--pos]);

Cheers
Andi

Posted 16-Nov-14 12:36pm

Andreas Gieriet

Solution 3

Newer solution

I think this is closer to your requirements?

C#

void reverse (int len, char *str )
{
    char *tmp=(char*)calloc(len, sizeof(char));
    const char *p=0;
    while(len--)
    {
        p=(str+len);
        strncat(tmp, p, 1);
    }

    strcpy(str,tmp);
    free(tmp);
}

Previous solution

I tried to do without pointers, but this best I work out.

C#

void reverse (int len, char *str )
{
    char rev[100];
    memset(rev,0,100*sizeof(char));
    int i=len;
    const char* p;
    while(i)
    {
        p=str+i-1;
        strcat(rev, p);
        *(str+i-1)='\0';
        i--;
    }
    strcpy(str,rev);
}

Posted 16-Nov-14 16:29pm

BacchusBeale

Updated 17-Nov-14 15:40pm

v2

Comments

Mortadda jafar 17-Nov-14 5:07am

hay
i want reserve without chang index for array
exmple with change index:
<pre lang="c++"></pre>
char array[20];
int i,j;
gets(array);
j=strlen(array);
for(i=j-1;i>=0;i--)
{printf("%c",array[i])
}

i want use (strncat & strncpy with for)...for Reverse string
but i don't know how i can do this
::
ex ::
<pre lang="c++"></pre>
char array[20];
int i,j;
j=strlen(array);
for(*******)
{
strncat(****) or strcat(***)
or strncpy(***) or strcpy;
}

and in the end i want Reverse string :^) :^)

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Sergey Alexandrovich Kryukov · Accepted Answer · 2014-11-16T05:53:00

It is not clear what do you mean by "reserve". It's possible that this is a mistake/typo.

However, doing anything to a string "without pointer and array" just sounds absurd. Why? Simply because a C string itself is a pointer; and an array at the same time.

Perhaps you just did not formulate the problem correctly. There is a popular problem often offered during different exams and interviews: given a C string, modify it to rearrange its characters in reverse order, without using another area of memory to store the string. That's it, it should be enough to have one-two auto variables representing intermediate characters or pointers, using the same memory area as the one of the source string. The problem is quite solvable, but with different degree of elegance. If that is a problem are interested in, we can discuss it, but no sooner than you show what have you tried so far.

—SA

Mortadda jafar · Accepted Answer · 2014-11-18T07:17:00

Solution 4

C++

#include <stdlib.h>
#include <string.h>

int main(int argc, char** argv) {
    char p[20], t;
    int i, n, j;
    gets(p);
    n = strlen(p) - 1;
    for (i = n, j = 0; i >= n / 2; i--, j++) {
        strncpy(&t, p + j, 1);
        strncpy(p + j, p + i, 1);
        strncpy(p + i, &t, 1);
    }
    puts(p);
}

Posted 18-Nov-14 7:17am

Mortadda jafar

Updated 18-Nov-14 12:54pm

v2

Comments

Andreas Gieriet 18-Nov-14 18:58pm

This has not even didactical sense. Why the heck do you employ strncpy or alike for placing *one* character at one position in a buffer? This is crap, sorry.
Think about the economics of programming - this is overkill and not maintainable, not easy readable, error prone. I can't see any positive aspect in such a solution.
Andi
PS: It's also "uncommon" to provide your own solution as a "solution". If you found an answer yourself, you may improve your question and tell so.

how Reverse string c

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