THINK++ — Engineering Visualized

Nested Decisions

Nested if Statements

An if statement inside another if statement. Used when a decision depends on a prior condition being true first.

NESTED STRUCTURE

if (age >= 18) {
    if (hasLicense) {
        cout << "Can drive";
    } else {
        cout << "Get a license first";
    }
} else {
    cout << "Too young";
}

Equivalent with logical AND

// Same logic, flattened:
if (age >= 18 && hasLicense) {
    cout << "Can drive";
}

BEST PRACTICE

Avoid deep nesting (3+ levels). Use logical operators or early returns to flatten the logic. Deep nesting makes code harder to read and debug.

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Nested If

Nested If

Nested if Statements

Nested if Statements