讲师希望我们编写一个程序,该程序可以仅在用户想要重新开始选择并添加选项以继续进行另一个选择时重新显示菜单。
我遇到的问题是当用户选择一个从 1 到 4 的数字并完成选择时,程序会询问用户是否要继续进行另一个选择,当用户说不时,程序仍然要求选择一个数字没有结束程序。
这是我到目前为止编写的代码:
#include<iostream>
using namespace std;
int sp;
int speed = 0;
int M, K, c, x;
const int MINspeed = 10;
const int MAXspeed = 40;
int GetSpeed();
int GetMinSpeed();
int GetMaxSpeed();
int CheckContinue();
int selection;
int GetSpeed()
{
char c;
while(true)
{
cout << "\nDo you want the speed in mph or km/h? \n"
<< "\nEnter M or K followed by Enter: " << endl;
cin >> c;
if( (c != 'M')&& (c != 'K'))
{
cout << "Incorrect Selection. Try Again! \n\n";
break;
}
if ( c == 'M')
{
cout << "\nSpeed in mph: " << speed << endl;
return speed;
}
else if(c == 'K')
{
double toKmPerHour = 1.61;
double speedInKmPerHour = speed * toKmPerHour;
cout << "\nSpeed in km/h:" << speedInKmPerHour << endl;
break;
}
CheckContinue();
}
return 0;
}
int GetMinSpeed()
{
cout << "MIN speed = " << MINspeed << endl;
CheckContinue();
return 0;
}
int GetMaxSpeed()
{
cout << "MAX speed = " << MAXspeed << endl;
CheckContinue();
return 0;
}
/*int SetSpeed(int sp)
{
cout << "The Set Speed is " << sp << endl;
return 0;
}
*/
void SetSpeed()
{
cout << "Input your speed: ";
cin >> speed;
CheckContinue();
}
int CheckContinue(void)
{
char x;
while(true)
{
cout << "\nDo you want to continue with another selection? \n"
<< "\nEnter Y or N followed by Enter: " << endl;
cin >> x;
if ( x == 'Y')
{
int selection;
cout << "Selection Menu" << endl;
cout << "--------------" << endl;
cout << "\n1. Set Speed" << endl;
cout << "2. Get Speed" << endl;
cout << "3. Get MAX Speed" << endl;
cout << "4. Get MIN Speed" << endl;
cout << "5. Exit" << endl;
cout << "\nYour selection :" <<endl;
cin >> selection;
switch(selection)
{
case 1:
SetSpeed();
break;
case 2:
GetSpeed();
break;
case 3:
GetMaxSpeed();
break;
case 4:
GetMinSpeed();
break;
case 5:
cout << "Good Bye" << endl;
break;
}
}
else if(x == 'N')
{
break;
}
}
return 0;
}
/*
In this menu function, it will ask the user to input the selection, ranging from 1 to 5.
If the user puts a number that is not between 1 to 5 or letters, then the program will
ask the user to input a valid selection.
*/
void menu()
{
int selection;
cout << "Selection Menu" << endl;
cout << "--------------" << endl;
cout << "\n1. Set Speed" << endl;
cout << "2. Get Speed" << endl;
cout << "3. Get MAX Speed" << endl;
cout << "4. Get MIN Speed" << endl;
cout << "5. Exit" << endl;
int bye = 0;
while(1)
{
cout << "\nYour selection :" <<endl;
cin >> selection;
bye = 0;
if((selection <= 5)&&(selection >= 1))
{
switch(selection)
{
case 1:
SetSpeed();
break;
case 2:
GetSpeed();
break;
case 3:
GetMaxSpeed();
break;
case 4:
GetMinSpeed();
break;
case 5:
cout << "Good Bye" << endl;
bye = -1;
break;
}
}
else
{
cout << "\nPlease input valid selection: " << endl;
cin >> selection;
switch(selection)
{
case 1:
SetSpeed();
break;
case 2:
GetSpeed();
break;
case 3:
GetMaxSpeed();
break;
case 4:
GetMinSpeed();
break;
case 5:
cout << "Good Bye" << endl;
bye = -1;
break;
}
}
if(bye == -1)
{
break;
}
}
}
int main()
{
menu();
return 0;
}//end of main function