The easiest way to do this is to use the Fmt function. This is included in the Formatting and I/O Library in CVI. These are very powerful functions. See the function panel to get more help for this function. Here is some example code which converts an integer to a string:
int num = 20; char *word[10];
Fmt (word, "%d", num);
Now the character array 'word' holds the string "10". This automatically null terminates the string also.