Sum a vector with a function

Read first Task 52

Sum a vector with a function

`std::vector` grows as you push into it, and a range-based `for` reads each element without an index.

Definition and example

Sum a vector with a function is the focus of this lesson. `std::vector` grows as you push into it, and a range-based `for` reads each element without an index. The task asks you to apply that idea in a small example: Task: Sum a vector with a function. What does this program print. 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 Capstone: structs, maps and errors

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// TASK sum-a-vector-with-a-function-02: Task: Sum a vector with a function. What does this program print?
// 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 total(const vector<int>& marks) {
    int sum = 0;
    for (int mark : marks) {
        sum += mark;
    }
    return sum;
}

int main() {
    vector<int> marks = {850, 920, 780, 640};
    // TODO: produce the required output for this task.
    cout << "Average: " << total(marks) / marks.size() << endl;
    return 0;
}

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Checks on this task:

The program output must match “Total: 3190 Average: 797”.

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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Sum a vector with a function

Sum a vector with a function

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