strncpy copy characters from strings res = strncpy(str1, num) str1 a character string or matrix of character strings. num an integer or a matrix of integers, maximum number of characters to be copied from source. res a character string or matrix of character strings. res = strncpy(str1, num) copies the first num characters of source str1 to destination res. num must have same dimensions than str1 or num must be an integer number. strcat strcmp