Impara else-if Statement in Dart | Conditional Statements

The else…if statement is useful to test multiple conditions. Following is the syntax of the same.

An if construct can contain any number of else if blocks of code;
It is not necessary to use the code block else.

if (first_expression)
{

} 
else if (second_expression)
{
 
} 
else
{ 

}

The else if statement works like if: it has a condition in () and a code block in {}. Once a condition is true and its block runs, the rest of the conditions are skipped.

main.dart


              12345678910111213141516
            
void main() {
  int num = 2;
    
  if(num > 0)
  {
    print("is positive");
  }
  else if(num < 0)
  {
    print("is negative");
  }
  else
  {
    print("is zero");
  }
}

The program defines a variable num with the value 2. It checks if num is greater than 0; if so, it prints "is positive". If num is less than 0, it prints "is negative". Otherwise, when num equals 0, it prints "is zero".

Task

Fix the code so that the program works correctly.

main.dart


              12345678910111213141516
            
void main() {
  var score = '2.0';
    
  if(score is int)
  {
    print('Type: int');
  } 
  ___ (___)
  {
    print('Type: double');
  }
  else
  {
    print('Type: other type');
  }
}

else if (score is double) - correct condition

main.dart


              12345678910111213141516
            
void main() {
  var score = '2.0';
    
  if(score is int)
  {
    print('Type: int');
  }
  else if (score is double)
  {
    print('Type: double');
  }
  else
  {
    print('Type: other type');
  }
}

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Sezione 3. Capitolo 3

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The else…if statement is useful to test multiple conditions. Following is the syntax of the same.

An if construct can contain any number of else if blocks of code;
It is not necessary to use the code block else.

if (first_expression)
{

} 
else if (second_expression)
{
 
} 
else
{ 

}

The else if statement works like if: it has a condition in () and a code block in {}. Once a condition is true and its block runs, the rest of the conditions are skipped.

main.dart


              12345678910111213141516
            
void main() {
  int num = 2;
    
  if(num > 0)
  {
    print("is positive");
  }
  else if(num < 0)
  {
    print("is negative");
  }
  else
  {
    print("is zero");
  }
}

Task

Fix the code so that the program works correctly.

main.dart


              12345678910111213141516
            
void main() {
  var score = '2.0';
    
  if(score is int)
  {
    print('Type: int');
  } 
  ___ (___)
  {
    print('Type: double');
  }
  else
  {
    print('Type: other type');
  }
}

else if (score is double) - correct condition

main.dart


              12345678910111213141516
            
void main() {
  var score = '2.0';
    
  if(score is int)
  {
    print('Type: int');
  }
  else if (score is double)
  {
    print('Type: double');
  }
  else
  {
    print('Type: other type');
  }
}

Tutto è chiaro?

Grazie per i tuoi commenti!

Sezione 3. Capitolo 3