THINK++ — Engineering Visualized

Decision Making

The if Statement

The simplest decision-making construct. The code block executes only when the condition evaluates to true.

SYNTAX

if (condition) {
    // executes when true
}

Example: Check positive number

int n = 10;
if (n > 0) {
    cout << n << " is positive";
}

Example: Multiple conditions

if (age >= 18 && hasID) {
    cout << "Entry allowed";
}

NOTE

If the body has only one statement, braces are optional — but always use them for readability and to prevent bugs when adding more lines later.

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