RADS Logo

🔀 Control Flow

Conditionals, loops, and flow control in RADS

If-Else Statements

RADS uses if, elif, and else for conditional execution.

Basic If Statement

if_basic.rads 
blast main() {
    turbo i32 age = 25;
    
    if (age >= 18) {
        echo("Adult");
    }
}

If-Else

if_else.rads 
blast main() {
    turbo i32 score = 85;
    
    if (score >= 90) {
        echo("Grade: A");
    } else {
        echo("Grade: B or lower");
    }
}

If-Elif-Else Chain

if_elif_else.rads 
blast main() {
    turbo i32 speed = 9500;
    
    if (speed > 9000) {
        echo("It's over 9000!");
    } elif (speed > 5000) {
        echo("Pretty fast!");
    } elif (speed > 1000) {
        echo("Moderate speed");
    } else {
        echo("Needs more turbo!");
    }
}

Comparison Operators

Operator Description Example
== Equal to if (x == 5)
!= Not equal to if (x != 0)
> Greater than if (x > 10)
< Less than if (x < 100)
>= Greater than or equal if (x >= 18)
<= Less than or equal if (x <= 99)

Logical Operators

Operator Description Example
&& Logical AND if (x > 0 && x < 100)
|| Logical OR if (x == 0 || x == 1)
! Logical NOT if (!is_valid)
logical_ops.rads 
blast main() {
    turbo i32 age = 25;
    turbo bool has_license = true;
    
    // AND operator
    if (age >= 18 && has_license) {
        echo("Can drive");
    }
    
    // OR operator
    if (age < 13 || age > 65) {
        echo("Discounted ticket");
    }
    
    // NOT operator
    if (!has_license) {
        echo("Need to get a license");
    }
}

Loop (While Loop)

The loop keyword creates a while loop that continues as long as the condition is true.

Basic Loop

loop_basic.rads 
blast main() {
    turbo i32 i = 0;
    
    loop (i < 5) {
        echo("Count: " + i);
        i = i + 1;
    }
}

Infinite Loop with Break

loop_infinite.rads 
blast main() {
    turbo i32 count = 0;
    
    loop (true) {
        echo("Iteration: " + count);
        count = count + 1;
        
        if (count >= 10) {
            break;
        }
    }
}

Loop with Continue

loop_continue.rads 
blast main() {
    turbo i32 i = 0;
    
    loop (i < 10) {
        i = i + 1;
        
        // Skip even numbers
        if (i % 2 == 0) {
            continue;
        }
        
        echo("Odd number: " + i);
    }
}

Cruise (For Loop)

The cruise keyword creates a for loop that iterates over ranges or collections.

Cruise Over Range

cruise_range.rads 
blast main() {
    // Cruise from 0 to 4 (exclusive end)
    cruise (i in 0..5) {
        echo("i = " + i);
    }
    
    // Cruise from 10 to 20
    cruise (n in 10..21) {
        echo("n = " + n);
    }
}

Cruise Over Array

cruise_array.rads 
blast main() {
    array<str> names = ["Alice", "Bob", "Charlie"];
    
    cruise (name in names) {
        echo("Hello, " + name + "!");
    }
    
    // Cruise over numbers
    array<i32> scores = [95, 87, 92, 78];
    cruise (score in scores) {
        echo("Score: " + score);
    }
}

Cruise with Break and Continue

cruise_control.rads 
blast main() {
    array<i32> numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
    
    cruise (num in numbers) {
        // Stop at 6
        if (num > 6) {
            break;
        }
        
        // Skip 3
        if (num == 3) {
            continue;
        }
        
        echo("Number: " + num);
    }
}

Switch Statements

Switch statements provide multi-way branching based on a value.

Basic Switch

switch_basic.rads 
blast main() {
    turbo i32 day = 3;
    
    switch (day) {
        case 1:
            echo("Monday");
            break;
        case 2:
            echo("Tuesday");
            break;
        case 3:
            echo("Wednesday");
            break;
        case 4:
            echo("Thursday");
            break;
        case 5:
            echo("Friday");
            break;
        default:
            echo("Weekend");
    }
}

Switch with Multiple Cases

switch_multi.rads 
blast main() {
    turbo char grade = 'B';
    
    switch (grade) {
        case 'A':
            echo("Excellent!");
            break;
        case 'B':
            echo("Good job!");
            break;
        case 'C':
            echo("Satisfactory");
            break;
        case 'D':
            echo("Needs improvement");
            break;
        case 'F':
            echo("Failed");
            break;
        default:
            echo("Invalid grade");
    }
}

Control Flow Keywords

Keyword Description Usage
if Conditional execution if (condition) { ... }
elif Else-if condition elif (condition) { ... }
else Default branch else { ... }
loop While loop loop (condition) { ... }
cruise For loop cruise (item in collection) { ... }
switch Multi-way branch switch (value) { ... }
case Switch case case value: ...
default Default switch case default: ...
break Exit loop/switch break;
continue Skip to next iteration continue;
return Return from function return value;

💡 Best Practices

  • Always use break in switch statements to prevent fall-through
  • Prefer cruise over loop when iterating over collections
  • Use elif chains instead of nested if statements for readability
  • Avoid infinite loops without a clear exit condition
  • Use meaningful variable names in cruise loops (e.g., cruise (user in users))