Vector indexing

Read first Task 32

Read and write items with [].

Definition and example

Vector indexing is the focus of this lesson. Read and write items with []. The task asks you to apply that idea in a small example: What does v[1] = 12000 do. Before you run the code, predict what should happen. Then Inspect the program output and the compiler message if it fails and compare it with your prediction. If the result differs, change one relevant line and run it again. Testing one change at a time makes the cause of a result easier to understand.

C++ 1 automatic check Section 4 · Collections and data

Code editor Ctrl + Enter runs

// TASK vector-indexing-02: What does v[1] = 12000 do?
// STEPS: Read the explanation. Change one relevant line at a time, then run the code and compare the result with the check on the right.
#include <iostream>
#include <vector>
using namespace std;

int main() {
    vector<int> fees{9000, 11667, 15000};
    // TODO: produce the required output for this task.
    fees[1] = 12000;
    cout << fees[1] << endl;
    return 0;
}

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Your result

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Checks on this task:

The program output must match “9000 12000”.

The task and step-by-step instructions are written as comments at the top of the editor. Change one relevant line, run it, and compare the result with these checks.

Incorrect attempts before answer: 0 / 3

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Vector indexing

Vector indexing

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