#include<stdio.h>
#include<conio.h>
char a1[50];  //GLOABAL VAR.
void reverse(int);
void main()
{
int count=0;
printf("enter the string :");
scanf("%s",a1);
for(int i=0;a1[i]!='\0';i++)
count++;
reverse(count);
getch();
}

void reverse(int count1)
{
char temp;
static int i=0;
  if(i<=count1/2)
    {
   temp=a1[i];
    a1[i]=a1[count1-1];
    a1[count1-1]=temp;
    i++;
   reverse(--count1);
    }
   else
    printf("\nthe reversed string is :%s",a1);
}




thank u

the corrected code is::: 	

#include<stdio.h>
#include<conio.h>
char a1[50];  //GLOABAL VAR.
void reverse(int);
void main()
{
int count=0;
printf("enter the string :");
scanf("%s",a1);
for(int i=0;a1[i]!='\0';i++)
count++;
reverse(count);
getch();
}

void reverse(int count1)
{
char temp;
static int i=0;
  if(i!=count)
    {
   temp=a1[i];
    a1[i]=a1[count1-1];
    a1[count1-1]=temp;
    i++;
   reverse(--count1);
    }
   else
    printf("\nthe reversed string is :%s",a1);
}

my next logic:::

#include<stdio.h>
#include<conio.h>
void reverse(char*,char*);
void main()
{
char a1[50],*p;
int count=0;
printf("enter the string:");
scanf("%s",a1);
for(int i=0;a[i]!='\0';i++)
count++;
p=a1+(count-1);
reverse(a1,p);
printf("the reversed one is : %s",a1);
getch();
}
void reverse(char *a1,char *p)
{
char temp;
if(a1<=p)
{
temp=*a1;
*a1=*p;
*p=temp;
reverse(++a1,--p);
}
}




thank u

#include<stdio.h>
#include<string.h>
char s1[50];
void reverse();
int main()
{
        scanf("%s",s1);
        reverse();
        return 0;
}
void reverse()
{
        char temp;
        int n=strlen(s1);
        static int i=0;
        if (i<n/2)
                {
                temp=s1[n-i-1];
                s1[n-i-1]=s1[i];
                s1[i]=temp;
                i++;
                reverse();
                }
                else
                printf("The reverse string is %s\n",s1);
}
~