C++ Nested If-Else Statements

Nested if-else statements in C++ allow you to check multiple conditions by placing one if-else statement inside another. This helps in handling complex decision-making scenarios.

1. Nested If-Else Example

A nested if-else allows executing different blocks based on hierarchical conditions.

#include <iostream>
using namespace std;

int main() {
    int num = 75;

    if (num >= 0) {
        if (num == 0) {
            cout << "Number is zero" << endl;
        } else {
            cout << "Number is positive" << endl;
        }
    } else {
        cout << "Number is negative" << endl;
    }

    return 0;
}

2. Common Mistakes

Be careful with indentation and braces. Missing braces can cause inner blocks to behave unexpectedly.

#include <iostream>
using namespace std;

int main() {
    int num = 5;
    if (num > 0)
        if (num < 10)
            cout << "Single-digit positive" << endl;
    else
        cout << "This else may not behave as expected" << endl;
    return 0;
}

Conclusion

Nested if-else statements help in checking multiple hierarchical conditions. Proper use of braces and indentation ensures clarity and prevents logic errors.