The 'if' Statement

Part of the Fundamentals section of Coddy's Dart journey — lesson 31 of 94.

The if statement in Dart evaluates a boolean condition and executes code only when that condition is true.

if (condition) {
  // Code to execute when condition is true
}

Example checking if a number is positive:

void main() {
  int number = 10;
  
  if (number > 0) {
    print('The number is positive');
  }
}

You can use any boolean expression as a condition:

void main() {
  int age = 20;
  bool hasLicense = true;
  
  if (age >= 18 && hasLicense) {
    print('You can drive');
  }
}

Challenge

Easy

Create a program that determines if a student has passed or failed an exam based on their score:

Declare an integer variable named examScore with a value of 68
Declare a constant integer named passingGrade with a value of 70
Use an if statement to check if the student's score is less than the passing grade
If the score is less than the passing grade, print: Exam status: Failed. You need to improve by X points. (where X is the number of points needed to reach the passing grade)
If the score is equal to or greater than the passing grade, print: Exam status: Passed. Good job!

Your output should match the expected format exactly.

Cheat sheet

The if statement in Dart evaluates a boolean condition and executes code only when that condition is true:

if (condition) {
  // Code to execute when condition is true
}

Example with a simple condition:

int number = 10;

if (number > 0) {
  print('The number is positive');
}

You can use complex boolean expressions with logical operators:

int age = 20;
bool hasLicense = true;

if (age >= 18 && hasLicense) {
  print('You can drive');
}

Try it yourself

void main() {
  // Declare your variables here
  int examScore = _;
  const int passingGrade = _;
  
  // Write your if statement here
  if (_) {
    int pointsNeeded = _;
    print("Exam status: Failed. You need to improve by $pointsNeeded points.");
  } else {
    print("Exam status: Passed. Good job!");
  }
}