LESSON 173 OF 409 · PROJECTS: EVERYDAY PROGRAMS

Report Card V5 - Subject to Grade Dictionary in C++

Practice

Use a dictionary, a loop, and conditionals to print each subject with its letter grade in alphabetical order.

You start with:

map<string, int> grades;
grades["Math"] = 92;
grades["English"] = 78;
grades["Science"] = 85;
grades["History"] = 67;

Build:

English: C
History: D
Math: A
Science: B

Rules:

Visit the subjects in alphabetical order.
Look up each subject's score in the dictionary and apply the grading scale (90+ A, 80s B, 70s C, 60s D, else F).
On each iteration print the subject, a colon and a space, then the grade, for example English: C.

Use a map<string, int> - it stores keys in sorted order.

map<string, int> grades;
grades["Math"] = 92;
grades["English"] = 78;
grades["Science"] = 85;
grades["History"] = 67;

for (auto& kv : grades) {
    const string& subject = kv.first;
    int score = kv.second;
    string grade;
    if (score >= 90) {
        grade = "A";
    } else if (score >= 80) {
        grade = "B";
    } else if (score >= 70) {
        grade = "C";
    } else if (score >= 60) {
        grade = "D";
    } else {
        grade = "F";
    }
    cout << subject << ": " << grade << endl;
}

STEP 1 OF 10

Guided

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Report Card V5 - Subject to Grade Dictionary in C++

Report Card V5 in C++