Reverse a string consecutively using two dimensional array in c

[mahavairavan]

Hi all,
Can anyone please enhance the following code to print a string reverely ina consecutive manner using two dimensional array.

The program which i tried in codepad.org is follows:

#include<stdio.h>
#include<string.h>
int main()
{
char a[4][4]={'j','u','s','t'};
int i,l,j,k,b=4,n;
printf("Enter the string");
printf("\n");
for(i=0;i<1;i++)
{
for(j=0;j<b;j++)
{
printf("%c",a[i][j]);
}
}
printf("\n");
n=b;
for(i=0;i<b-1;i==0)
{
for(k=n-1;k<b;k++)
{
printf("%c",a[i][k]);
}
for(j=0;j<n-1;j++)
{
printf("%c",a[i][j]);
}
printf("\n");
n--;
}
}

The output which i got was:
Enter the string
just
tjus
stju
ustj
just
�just
B�just
�B�just
0�B�just
@0�B�just
@0�B�just
X@0�B�just
(X@0�B�just
@(X@0�B�just
@(X@0�B�just
�@(X@0�B�just
��@(X@0�B�just
@��@(X@0�B�just
@��@(X@0�B�just
U@��@(X@0�B�just
�U@��@(X@0�B�just
�U@��@(X@0�B�just
�U@��@(X@0�B�just
�U@��@(X@0�B�just

The output should be
eg if the input string is just it should print
just
tjus
stju
ustj
The program print the above output but in the second i loop,since the i value is getting incremented it will print
just
tjus alone and gets terminated.So for that i made the loop not to increment but it results in the folloing out put.please rewrite this program to accept input dynamically many strings and reverse it as i showed the output in second please.

[WaltP]

Start by formatting the code so we can follow it.

[Tumlee]

In the comments you'll see some potential problems with this code.

#include<stdio.h>
#include<string.h>
int main()
{
    //You're intializing a two dimensional array with a one-dimensional initializer.
    //This may cause problems.
    char a[4][4]={'j','u','s','t'};
    int i,l,j,k,b=4,n; //If b is the number of characters, why not name it numchars or something like that?

    //Asking the user to enter a string and not giving him a chance to input.
    printf("Enter the string");
    printf("\n");

    //What's the point of this loop? It only executes once while i is zero.
    for(i=0;i<1;i++)
    {
        for(j=0;j<b;j++)
        {
            printf("%c",a[i][j]);
        }
    }

    printf("\n");
    n = b;
    
    //Huh? i==0? This is probably your problem. i is never changing in this loop at all.
    //b also never changes, so your loop will go on forever.
    for(i=0;i<b-1;i==0)
    {
        //Even if i was properly incrementing, you never set all 16 the values in the
        //array. You'll be reading from uninitialized garbage when i is greater than zero.
        for(k=n-1;k<b;k++)
        {
            printf("%c",a[i][k]);
        }
        for(j=0;j<n-1;j++)
        {
            printf("%c",a[i][j]);
        }
        printf("\n");
    //Because your loop is infinite, n becomes a negative number, forcing this value
    //into k will force your program to read a negative index in the array, crashing
    //your program.
        n--;
    }
    //ALL programs should have a return statement at the end of main().
    //In most cases, you want to return 0;
}