3. Decisions

else if and nested decisions

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Reading 1

Chains of else if

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When you have three or more branches, chain else if. Only the first true condition runs; the rest are skipped.

You can also nest an if inside another if or else. That is useful when a second check only matters after the first one passes.

Keep nesting shallow when you can — long else if chains are often clearer than deep nesting.

if (score >= 90) {
    cout << "A" << endl;
} else if (score >= 80) {
    cout << "B" << endl;
} else if (score >= 70) {
    cout << "C" << endl;
} else {
    cout << "below C" << endl;
}

Check 2

Which branch runs

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score is 85. Which message prints in the A/B/C chain above?

Fill in 3

Middle branch

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Try it 4

Grade bands

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Sample input is 72. Run it, then try 95 and 60.

main.cpp

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Program input (stdin)

Output will appear here.

Assignment 5

Sign of a number

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Read one integer. Print positive if it is greater than 0, zero if it is 0, and negative if it is less than 0. Exact words, one line.

main.cpp

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if and else Logical operators