/* * File: lastchar.c * ---------------- * This file defines the function LastChar, which returns the * last character in a string. */#include <stdio.h>#include "genlib.h"#include "strlib.h"#include "simpio.h"/* Function prototypes */char LastChar(string str);/* Main program */main(){    string str;    printf("This program displays the last character in a string.\n");    printf("Enter a string: ");    str = GetLine();    printf("The last character is '%c'\n", LastChar(str));}/* * Function: LastChar * Usage: ch = LastChar(str); * -------------------------- * This function returns the last character in the string str. * If LastChar is called on the empty string, an error condition * is reported because the IthChar function performs range * checking on the index. */char LastChar(string str){    return (IthChar(str, StringLength(str) - 1));}