Learn

So what happens when you want to change each of the values within a vector?

You can use a for loop!

For example, suppose we have an int vector that looks like this:

You can write a for loop that iterates from 0 to vector.size(). And here’s the cool part: you can use the counter of the for loop as the index! Woah.

for (int i = 0; i < vector.size(); i++) {

  vector[i] = vector[i] + 10;

}

This will change the vector to:

Here, we incremented i from 0 to vector.size(), which is 3. During each iteration, we are adding 10 to the element at position i:

When i = 0, we added 10 to vector[0]
When i = 1, we added 10 to vector[1]
When i = 2, we added 10 to vector[2]

Instructions

In the code editor, there is a double vector named delivery_order that is storing the prices of some food items.

There is also a double variable named total that’s already declared and initialized.

Write a for loop that iterates through the delivery_order vector (from 0 to delivery_order.size()). And add each order to total during each iteration.

Output the final total using std::cout.

Take this course for free

By signing up for Codecademy, you agree to Codecademy's Terms of Service & Privacy Policy.

Or sign up using:

Already have an account?