Reversing a string in c with recursion

Question

I have written code to reverse a string in c... it works fine but I can\'t return the reversed string in the main() function.

#include

        

Answer 1

a little change in Emre Can Kucukoglu's answer . . . we can eliminate strncat_s

void revstr_rec(char *sstr, char *dstr, int len)
{
    int i = 0;
    if((! *sstr) || (! len) )
        return;

    revstr_rec(sstr + 1, dstr, len - 1);
    dstr[len - 1] = *sstr;

    return;
}

int main()
{
    char *sstr = NULL;
    char *dstr = NULL;

    sstr = malloc(16);
    if(! sstr)  {
        printf("no memory . . .\n");
        return 0;
    }
    strcpy(sstr, "hello world !");
    printf("sstr: %s\n", sstr);

    dstr = malloc(16);
    if(! dstr)  {
        printf("no memory . . .\n");
        return 0;
    }

    revstr_rec(sstr, dstr, strlen(sstr));
    printf("dstr(recursive): %s\n", dstr);

    free(sstr);
    free(dstr);

    return 0;
}