[root@alpha s7]# ./ex11.o
Hello
Hello



Reverse ---
Reverse


[root@alpha s7]# cat ex11.c
#include <stdio.h>

void reverse(char *str);

void reverse(char *str)
{
        int len = strlen(str);
        int fIndex = 0 ;
        int lIndex = len;
        char temp;

        printf("%s \n",str);
        while (fIndex < lIndex)
        {
                temp = str[fIndex];
                *(str+fIndex) = *(str+lIndex);
                *(str+lIndex) = temp;
                printf("%s \n",str);
                fIndex++;
                lIndex--;
        }
        printf("Reverse --- %s \n",str);
}


int main()
{
        char string[] = "Hello";

        printf("%s \n",string);
        reverse(string);
        printf("Reverse %s \n",string);
        return 0;
}