/* * File: signtest.c * ---------------- * Reads in a number and classifies it according to its sign. */#include <stdio.h>#include "genlib.h"#include "simpio.h"main(){    int n;    printf("Program to classify a number by its sign.\n");    printf("n = ? ");    n = GetInteger();    if (n > 0) {        printf("That number is positive.\n");    } else if (n == 0) {        printf("That number is zero.\n");    } else {        printf("That number is negative.\n");    }}