Variables and loops

8 min 20 XP + 10 for no hints

C++ needs to know a variable's type. int holds whole numbers: int total = 0;

A for loop repeats code. for (int i = 1; i <= 5; i++) starts i at 1, keeps going while i <= 5, and adds 1 each time.

total += i; is short for total = total + i;. Open Step through to watch i and total change on every pass.

Example

for (int i = 1; i <= 3; i++) {
    std::cout << "Round " << i << std::endl;
}

Output

Round 1
Round 2
Round 3

Changing the number in the loop condition changes how many times the loop runs.

Your tasks

0 of 3 done

Change the loop so it adds the numbers 1 to 10
Store your favorite number in a new int variable
Print that variable with std::cout

Quick check

In the starter code, what is total after the loop?

loop.cppChecked as you type

#include <iostream>

int main() {
    int total = 0;
    for (int i = 1; i <= 5; i++) {
        total += i;
    }
    std::cout << "Total: " << total << std::endl;
    return 0;
}

No problems found. Unclosed tags, missing semicolons and errors show up here in plain words.

1#include <iostream>

3int main() {

4 int total = 0;

5 for (int i = 1; i <= 5; i++) {

6 total += i;

7 }

8 std::cout << "Total: " << total << std::endl;

9 return 0;

10}

total is created and set to 0.

Variables

total

Output

Step 1 of 14

Variables and loops

Your tasks

Tutor

Quick check

Variables

Output