Calories counting loop - c++

Question

Question:
Create a program that first asks the user to enter the number of items he/she has eaten today and then to enter the number of calories for each item. It then calculates the number of calories he/she has eaten for the day and displays the value.
#include <iostream>
using namespace std;
int main()
{
int numberOfItems;
int count; // loop counter for the loop
int caloriesForItem;
int totalCalories;
cout << "How many items did you eat today? ";
cin >> numberOfItems;
cout << "Enter the number of calories in each of the " << numberOfItems << " items eaten:" >> endl;
while (caloriesForItem)
{
cout << "Please enter item calories:";
cin >>caloriesForItem;
count == numberOfItems;
}
cout << "Total calories eaten today = " << totalCalories;
return 0;
}
In the end I'm not sure how I would make it read and calculate as it says it must be a while loop.

Answer 1

You have all of your pieces already. You have a count for your loop, a totalCalories tracker, and a variable to hold the current items caloriesForItem. Every iteration of your loop must increase the count, and every iteration must retrieve a new value for caloriesForItem. You can add this each time to totalCalories.

Answer 2

#include <iostream>
using namespace std;
int main()
{
int numberOfItems;
int caloriesForItem;
// These two variables need to have a start value
int count = 0;
int totalCalories = 0;
cout << "How many items did you eat today? ";
cin >> numberOfItems;
cout << "Enter the number of calories in each of the " << numberOfItems << " items eaten:" >> endl;
// Loop for as many times as you have items to enter
while (count < numberOfItems)
{
cout << "Please enter item calories:";
// Read in next value
cin >> caloriesForItem;
// Add new value to total
totalCalories += caloriesForItem;
// Increase count so you know how many items you have processed.
count++;
}
cout << "Total calories eaten today = " << totalCalories;
return 0;
}
You were pretty close though.
(I added comments in the appropriate places to explain whats going on.)
Lastly I want to add that you pretty much can convert any for loop to a while loop using this themplate:
for( <init_var>; <condition>; <step> ) {
// code
}
becomes
<init_var>;
while( <condition> ) {
// code
<step>;
}
Example:
for(int i = 0; i < 10 i++) {
cout << i << endl;
}
becomes
int i = 0;
while(i < 10) {
cout << i << endl;
i++;
}

Answer 3

Take a look at this code:
#include <iostream>
using namespace std;
int main()
{
int numberOfItems, caloriesForItem, totalCalories=0;
cout << "How many items did you eat today? ";
cin >> numberOfItems;
cout << "Enter the number of calories in each of the " << numberOfItems << " items eaten:" << endl;
while (numberOfItems--)
{
cout << "Please enter item calories:";
cin >> caloriesForItem;
totalCalories += caloriesForItem;
}
cout << "Total calories eaten today = " << totalCalories;
return 0;
}
It's a sufficient way to do what you wanted, if you don't understand, let me know!