Define a character array and use strcpy() to copy a string into it. Print the string out by using a loop with a pointer to print out one character at a time. Initialize the pointer to the first element and use the double plus sign to increment the pointer. Use a separate integer variable to count the characters to print. Modify the program from programming exercise 1 to print out the string backwards by pointing to the end and using a decrementing pointer.

Nice, computer science homework.
int main () { char str[]="this is my string";
//print our string forwards int i = 0; while(str[i]!="\0") { putchar( str[i] ); i++; }
//newline putchar('\n');
//print our string backwards int length = strlen(str); while(length--) { putchar( str[length] ); } }
I didn't test this to make sure it worked, but this is the general way of doing this. It looks like your professor wants you to use pointers. I used pointers here. Do you know how? Arrays are pointers with some syntactic sugar.
I wouldn't rely on sites like this to get answers to your homework. Even if you get the right answer, there's always the possibility of your CS professor finding this answer online and then making your future homework ten times harder.