/* * File: secondh.c * --------------- * This file defines the function SecondHalf(str), * which returns the second half of its argument. */#include <stdio.h>#include "genlib.h"#include "strlib.h"#include "simpio.h"/* Function prototypes */string SecondHalf(string str);/* Main program */main(){    string str;    printf("Enter a string: ");    str = GetLine();    printf("The second half of \"%s\" is \"%s\"\n", str,           SecondHalf(str));}/* * Function: SecondHalf * Usage: newstr = SecondHalf(str); * -------------------------------- * This function returns the second half of the string str. * If the string contains an odd number of characters, the * center character is included in the result. */string SecondHalf(string str){    int len;    len = StringLength(str);    return (SubString(str, len / 2, len - 1));}