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C# if...else Statement
The if...else statement allows you to execute different blocks of code based on conditions.
Basic if Statement
int age = 18;
if (age >= 18)
{
Console.WriteLine("You are an adult");
}if...else Statement
int score = 85;
if (score >= 90)
{
Console.WriteLine("Grade: A");
}
else
{
Console.WriteLine("Grade: B or lower");
}if...else if...else Statement
int score = 85;
if (score >= 90)
{
Console.WriteLine("Grade: A");
}
else if (score >= 80)
{
Console.WriteLine("Grade: B");
}
else if (score >= 70)
{
Console.WriteLine("Grade: C");
}
else if (score >= 60)
{
Console.WriteLine("Grade: D");
}
else
{
Console.WriteLine("Grade: F");
}Nested if Statements
int age = 25;
bool hasLicense = true;
if (age >= 18)
{
if (hasLicense)
{
Console.WriteLine("You can drive");
}
else
{
Console.WriteLine("You need a license to drive");
}
}
else
{
Console.WriteLine("You are too young to drive");
}Logical Operators in Conditions
int age = 25;
bool hasJob = true;
double income = 50000;
// AND operator
if (age >= 18 && hasJob)
{
Console.WriteLine("Eligible for loan");
}
// OR operator
if (age >= 65 || income < 20000)
{
Console.WriteLine("Eligible for discount");
}
// NOT operator
if (!hasJob)
{
Console.WriteLine("Unemployed");
}💡 Best Practices
- Always use braces {} even for single statements
- Keep conditions simple and readable
- Use logical operators to combine conditions
- Consider using switch for multiple discrete values
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