loops

[mnnguyen94]

Hi I'm having trouble running my program. It has to have a loop and the intervals for the speed is 0-100 and the intervals for the time is 0-12. I hope someone can help me!

[code]
//This is a program that asks the user the speed
// of the vehicle and the distance it has traveled.
// It was written by Michelle Nguyen.
#include <iostream>
using namespace std;

int main ()
{
const int minSpeed = 0, // starting speed of the vehicle
maxSpeed = 100, // max speed of the vehicle
minTime= 0, // starting time
maxTime = 12; //max number of hours the vehicle can travel.
double time, distance, speed;

cout <<"What is the speed of the vehicle? ";
cin >> speed;
while (speed <0)
{
cout << "Please enter a positive number for the speed: ";
cin >> speed;
}

while (speed > 101)
{
cout <<"Please enter a speed less than 101: ";
cin >> speed;
}

while (time <0)
{
cout <<"Please enter a postive number for the time: ";
cin >> time;
}

while (time >13)
{
cout << "Please enter a time less than 13: ";
cin >> time;
}

distance = time*speed;
cout << endl;
cout << "hour" << "\t\t" << "distance traveled"<< endl;
cout << "--------------------------"<<endl;

for (int count = 0; count <=time; count++);
{
cout << hour << "\t\t" << speed*time << endl;
}
return 0;
}

[18hRX9L8]

I'm not sure why you have two loops for the same variable. In your while loop you can test the variable for minimum and maximum values using (in this case) || operator. Read up on operators here: http://www.cplusplus.com/doc/tutorial/operators/#logical-operators.

Ex:

while(x<0 || x>13) {
          std::cout << std::endl << "Please enter in a number between 0 and 13: ";
          std::cin >> x;
}

Also, none of your loops are going to run because time and speed are uninitialized. That is why you should use do-while loops. See reference: http://www.cplusplus.com/doc/tutorial/control/#do-while.