Range checks using a switch statement

Question

My teacher has assigned a program to use both if-else statements and switch statements, so we understand how to implement both. The program asked u

Answer 1

We need to fit in the input, so, instead of this code:

if (BMI < 18.5) {
        q = 1;
    }
    else if (BMI >= 18.5 && BMI < 25.0) {
        q = 2;
    }
    else if (BMI >= 25.0 && BMI < 30.0) {
        q = 3;
    }
    else if (BMI >= 30.0 && BMI < 35) {
        q = 4;
    }
    else {
        q = 5;
    }

    switch (q) {
    case 1: cout << "You are underweight" << endl; break;
    case 2: cout << "You are a normal weight " << endl; break;
    case 3: cout << "You are overweight" << endl; break;
    case 4: cout << "You are obese" << endl; break;
    case 5: cout << "You are gravely overweight" << endl; break;

    }

You need something like

switch (1 + (BMI >= 18.5) + (BMI >= 25) + (BMI >= 30) + (BMI >= 35)) {
    case 1: cout << "You are underweight" << endl; break;
    case 2: cout << "You are a normal weight " << endl; break;
    case 3: cout << "You are overweight" << endl; break;
    case 4: cout << "You are obese" << endl; break;
    case 5: cout << "You are gravely overweight" << endl; break;
}

The logic is to convert the if-elses into a mathematical formula, returning an int.