Reversing a word in C and then storing that reversed word to use in a printf-CodePudding

So basically I'm trying to reverse a word (a single word, not a string with multiple words) and I've managed to reverse the word using this

{
    int end, x;
    end = strlen(myString) - 1;
    for (x = end; x >= 0; --x) {
        printf("%c", myString[x]);
    }
}

(myString is defined somewhere else in the code)

But here's the kicker, I need to print the reversed word like this:

printf("The word reversed is '%c'", myString);

And I've no idea how to actually take the word reversed by the for loop and putting it into the second printf command. Any ideas?

CodePudding user response：

Here you are.

for ( size_t i = 0, n = strlen( myString ); i < n / 2; i   )
{
    char c = myString[i];
    myString[i] = myString[n - i - 1];
    myString[n - i - 1] = c;
}

printf("The word reversed is '%s'\n", myString);

CodePudding user response：

If the string you are passed is a literal instead of an allocated pointer, you'll need to make a reverse-copy of the string into an allocated buffer. Same applies if you are trying to avoid corrupting the orignial string.

// allocate a buffer big enough to hold a copy of the string
int len = strlen(myString);
char* reverse = malloc(len 1);

// reverse copy it over.
for (size_t i = 0; i < len; i  )
{
    reverse[i] = myString[len-1-i];
}
reverse[len] = '\0'; // null terminate our new string

printf("Reversed word: %s\n", reverse);

// free the string when you are done with it
free(reverse);