1. Reverse a string in C using as little additional memory as possible.

// C program using recursion to reverse a string.

# include
void reverseString(char *str)
{
if (*str)
{
reverseString(str+1);
printf("%c", *str);
}
}

int main()
{
char a[] = "India is a great country";
reverseString(a);
return 0;
}