#include <iostream>;
#include <iomanip>;
#include <string>;
using namespace std;
//here are the functions. the names are the same as below to make it easier for me and you to read but
// i fully understand that they do not have to be the same names do to the scopes of the variables
class car
{
public:
int current;
void get_Accelerate (int, int);
int accelerate() {return current;};
void get_Brake (int, int);
int brake() {return current;};
void get_Cruise (int, int);
int cruise() {return current;};
};
double updateIntervalFeetTraveled(double previousSpeed, double currentSpeed) {
int timeInterval =1;
double averageSpeed = (previousSpeed + currentSpeed)/2;
double averageSpeed_FeetPerSecond = averageSpeed * 5280.0/3600.0;
double intervalFeetTraveled = averageSpeed_FeetPerSecond * timeInterval;
return intervalFeetTraveled;
}
void car::get_Accelerate (int previousSpeed, int speed) {
if((previousSpeed + speed) > 125){
current = 125;
}else{
current = previousSpeed + speed;
}
}
void car::get_Cruise (int previousSpeed, int speed) {
current = previousSpeed;
}
void car::get_Brake (int previousSpeed, int speed) {
if((previousSpeed - speed) >=0){
current = previousSpeed - speed;
}
else{
current = 0;
}
}
int previousSpeed =0;
int currentSpeed=0;
int speedInt=0;
double intevalFeet=0;
double totalFeet =0;
string function, currentState, command;
car car1;
void demoFunction(string x, int speedInt){
if(x.compare("a") == 0) {
car1.get_Accelerate(previousSpeed, speedInt);
currentSpeed = car1.accelerate();
intevalFeet = updateIntervalFeetTraveled(previousSpeed, currentSpeed);
totalFeet = totalFeet + intevalFeet;
function="accelerate";
if(currentSpeed>previousSpeed){
currentState = "Accelerating";
}else if (currentSpeed == 0){
currentState="Stopped";
}else if(currentSpeed == previousSpeed){
currentState="Cruising";
}else if(currentSpeed<previousSpeed){
currentState="Braking";
}
previousSpeed = currentSpeed;
}else if(x.compare( "c") == 0){
car1.get_Cruise(previousSpeed, speedInt);
currentSpeed = car1.cruise();
intevalFeet = updateIntervalFeetTraveled(previousSpeed, currentSpeed);
totalFeet = totalFeet + intevalFeet;
function="cruise";
if(currentSpeed>previousSpeed){
currentState = "Accelerating";
}else if (currentSpeed == 0){
currentState="Stopped";
}else if(currentSpeed == previousSpeed){
currentState="Cruising";
}else if(currentSpeed<previousSpeed){
currentState="Braking";
}
previousSpeed = currentSpeed;
}else if(x.compare("b") == 0) {
if(currentSpeed>0){
car1.get_Brake(previousSpeed, speedInt);
currentSpeed = car1.brake();
intevalFeet = updateIntervalFeetTraveled(previousSpeed, currentSpeed);
totalFeet = totalFeet + intevalFeet;
function="brake";
if(currentSpeed>previousSpeed){
currentState = "Accelerating";
}else if (currentSpeed == 0){
currentState="Stopped";
}else if(currentSpeed == previousSpeed){
currentState="Cruising";
}else if(currentSpeed<previousSpeed){
currentState="Braking";
}
previousSpeed=currentSpeed;
}else{
car1.get_Cruise(previousSpeed, speedInt);
currentSpeed = car1.cruise();
intevalFeet = updateIntervalFeetTraveled(previousSpeed, currentSpeed);
totalFeet = totalFeet + intevalFeet;
function="brake";
if(currentSpeed>previousSpeed){
currentState = "Accelerating";
}else if (currentSpeed == 0){
currentState="Stopped";
}else if(currentSpeed == previousSpeed){
currentState="Cruising";
}else if(currentSpeed<previousSpeed){
currentState="Braking";
}
previousSpeed=currentSpeed;
}
}
if(command != "d"){
cout<<setw(5)<< "Function"<<setw(15)<<"Current State"<<setw(15)<<"Current Speed"<<setw(15)<<"Interval Distance"<<setw(15)<<"Total feet traveled"<<endl;
}
cout<<setw(10)<<function<<setw(15)<<currentState<<setw(15)<<currentSpeed<<setw(15)<<intevalFeet<<setw(15)<<totalFeet<<endl;
}
int main(){
string demo[] = {"c","c","c","a","a","a","a","c","c","c","c","b","b","b","b","b","b","b","b"};
cout << "2013 Ford Fiesta. 119 hp, 1.4 liter engine. the fastest car around.....that a 22 year old can afford."<<endl;
cout<<""<<endl;
cout<< fixed<<setprecision(2)<<showpoint;
cout<<" "<<endl;
cout<<endl;
while (true){
cout<<" "<<endl;
cout<< "Enter single-letter command (or 'h' for help): "<<endl;
getline(cin, command);
if( command == "h") {
//help command
cout << "Supported commands: \n"
<< " a Accelerate the car\n"
<< " h print this help text.\n"
<< " b brake the car\n"
<< " c Cruise the car\n"
<< " q Exit the program\n"
<< " d Demo program\n"
<< endl;
}else if(command =="q"){
//command to quit the program
cout<<"Exit.";
return 0;
}else if(command == "a"){
//command to accelerate the car
cout<<"Enter a positive integer to accelerate by"<<endl;
cin >> speedInt;
cin.ignore();
if(!cin){
cin.clear();
cout<<"You have entered a non numeric character"<<endl;
}else{
if(speedInt > 0){
demoFunction("a", speedInt);
}else{
cout<<"you have entered a negative number or a 0. Please try again"<<endl;
}
}
}else if(command =="b"){
//command to brake the car
cout<<"Enter a positive integer to decelerate by"<<endl;
cin >>speedInt;
cin.ignore();
if(!cin){
cin.clear();
cout<<"You have entered a non numeric characer"<<endl;
}else{
if(speedInt > 0){
if(speedInt <=currentSpeed){
demoFunction("b", speedInt);
}else{
speedInt = currentSpeed;
demoFunction("b", speedInt);
}
}else{
cout<<"you have entered a negative number or a 0. Please try again"<<endl;
}
}
}else if(command =="c"){
//command to cruise the car
demoFunction("c", 0);
}else if(command == "d"){
cout<<setw(10)<< "Function"<<setw(15)<<"Current State"<<setw(15)<<"Current Speed"<<setw(15)<<"Interval Distance"<<setw(15)<<"Total feet traveled"<<endl;
int size_of_Demo = sizeof( demo ) / sizeof( demo[ 0 ] );
for(int i=0; i<size_of_Demo;i++){
string x = demo[i];
demoFunction(x,5);
}
}else{
cout<<"That is not a proper input command, please try again. press 'h' for help"<<endl;
}
}
return 0;
}
我必须采取我迄今为止所做的工作并制造和加速/制动/巡航功能。我需要这样做，所以我可以制作一个演示命令，将这些函数调用一段预定的时间。我将使用“d”命令来运行演示。我不确定如何创建我可以调用的函数，而不是手动输入，就像我为'a'，'b'和'c'的输入选项所做的那样。
你们帮了很多忙。这就是我现在所做的工作。我唯一的问题是如果为速度输入非数字编号，如何使程序不崩溃。我试图尝试捕捉工作，但我还没有完全弄清楚如何正确地做到这一点。
这是问题的最终答案。谢谢您的帮助。如果有人能将问题重新提升到0，我将不胜感激。
答案 0 :(得分：2)
建议使用属性currentSpeed，previousSpeed等创建Car类。将此类所需的函数添加到此类中，如acceleration（double amt），brake（double amt）等。您已经编写了这些函数。然后
main()
{
Car car; // creates a stopped car
...
while (true)
{
...
if (command == "a") car.accelerate(5);
else if (command == "b") car.brake(5);
etc. etc.
我认为这将为您提供更清晰，更容易修改的解决方案。