I'm having difficulty appending a character value of an array onto a string (handSorted). The hand[] is a predefined array of text.
char *handSorted = malloc(strlen(hand)+1);
strcat(handSorted, hand[2]);
For example I would like handSorted to be a string of the value of hand[2], the letter 'A'.
When dealing with C, it is good to learn how to use the manual pages in the terminal. Here is the entry for strcat.
DESCRIPTION
The strcat() and strncat() functions append a copy of the
null-terminated string s2 to the end of the null-terminated
string s1, then add a terminating `\0'.
That's one problem. You need handSorted to be null terminated.
char *handSorted = malloc(strlen(hand)+1);
handSorted[0] = '\0';
strcat(handSorted, hand[2]);
But there is still a problem. hand[2] is a single character, and strcat() expects a character pointer, AKA a string. So you need to pass it the address of a character using the 'address-of' operator - the &. Like this.
char *handSorted = malloc(strlen(hand)+1);
handSorted[0] = '\0';
strcat(handSorted, &hand[2]);
I think that is what you we're after.
handSorted and hand are both type of char*, now with this at mind, assuming handSorted[0] == '\0', strcat would perform the same as hand.substr(2, hand.length - 1). See for yourselfhandSorted. But since he was using char* and strcat I made the (incorrect) assumption that he wanted to be working with strings.The strcat function expects both arguments to be null-terminated strings (pointers, too), as you're passing into a character by value this is going to lead to undefined behavior (probably a segfault crash as it would try to read a low memory address likely outside an allocated area).
If you're adding a single character, you might as well just set the character value directly:
size_t charLength = strlen( handSorted );
assert( charLength < sizeof( handSorted ) + 1 ); // assuming handSorted hasn't decomposed from char[N] to char*.
handSorted[ charLength ] = hand[2]; // overwrite existing null-terminator with desired char
handSorted[ charLength + 1 ] = '\0'; // set new null-terminator
