5. If statements

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Q) Fill in the IF's condition

Imagine you are creating the safety system for a bus. The bus can hold up to 20 people safely. Consider the following code.

cout << "How many people are on the bus?" << endl;
int numPeople = 0; 
cin >> numPeople;

if (XXXXXXX) {
	cout << "The bus is safe." << endl;
} else {
	cout << "The buss is overloaded." << endl;
}

Which of the following options should replace the XXXXXXX?

a) numPeople <= 20
b) numPeople < 20
c) numPeople >= 20
d) numPeople > 20

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Q) Nested-If

Consider the following code fragment:

double rainfall = ??????;
    double temperature = ?????;
    string message;

    if (rainfall < 10) {
        message = "Dry and ";
        if (temperature >= 40) {
            message += "hot";
        } else {
            message += "cold";
        }
    } else if (rainfall < 20) {
        message = "Wet and ";
        if (temperature >= 40) {
            message += "warmer than usual";
        } else {
            message += "average";
        }
    } else {
        message = "Far too wet";
    }
    cout << message << endl;

Which of the following values for rainfall and temperature make the above code print "Wet and average"?

a) rainfall = 7.3, temperature = 53.5
b) rainfall = 5.6, temperature = 34.2
c) rainfall = 14.1, temperature = 53.2
d) rainfall = 16.2, temperature = 24.3

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Answers

a) numPeople <= 20
d) rainfall = 16.2, temperature = 24.3