Control flow using "if"

Execution Flow

Code Executed line-by-line
Actions are performed & control flow may change
- Specific conditions can change control flow
  - "if"
  - "else"

Example - Simple Flow

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let a = 1;
let b = 2;
let c = 3;

Example - if..else

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let a = 99;
if a > 99 {
	println!("Big number");
} else {
	println!("Small number");
}

Example - Nested if..else

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let a = 99;
if a > 99 {
	if a > 200 {
		println!("Huge number");
	} else {
		println!("Big number");
	}
} else {
	println!("Small number");
}

Example - if..else if..else

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let a 99;
if a > 200 {
	println!("Huge number");
} else if a > 99 {
	println!("Big number");
} else {
	println!("Small number");
}

Note

Same thing just instead of nesting using else if (which is checked only when the if and else if above it evaluate to false)

let a 99;
if a > 99 {
	println!("Big number");
} else if a > 200 {
	println!("Huge number");
} else {
	println!("Small number");
}

This will not work

Because the first if if a > 99 is checked first, when we have a number bigger than 200 it will evaluate o true because said number is bigger than 99 and so the checks will never reach the 200 part