Java 条件天气

Question

Conditional assingment that checks for if less than or greater than a number print the how the weather is like. The code seems fine but the some of the checks don't pass had the code checked by two other people that know about java than me. We think that there is a bug on the check/test side.

here are the instructions

1. Prints “The weather is extremely hot!” IF the user types a number greater than or equal to 90

2. Prints “The weather is mildly hot.” (else) IF the user types a number less than 90 and greater than 70

3. Prints “The weather is rainy and hot” (else) IF the user types a number less than 90 and greater than 70 and isRaining is true

4. Prints “The weather is neutral.” (else) IF the user types a number between 60 and 70 (greater than 60, but less than 70)

5. Prints “The weather is cold!” (else) IF the user types a number less than 60

6. Prints “The weather is rainy and cold” (else) IF the user types a number less than 60 and isRaining is true

7. Prints “The weather is below freezing!” IF the user types a number less than 0

Below is my code, 7/10 of the checks passed and at one point 8/10 passed

import java.util.Scanner; 

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int temperature = sc.nextInt();
    boolean isRaining = sc.nextBoolean();
    // Write your code below this line!
    
    if(temperature >= 90){
      System.out.println("The weather is extremely hot!");
    }
    
    else if(temperature < 90 && temperature > 70 && isRaining == false) {
      System.out.println("The weather is mildly hot.");
    }

    else if((temperature < 90 && temperature > 70) && isRaining == true) {
      System.out.println("The weather is rainy and hot.");
    }

    else if(temperature > 60 && temperature < 70) {
      System.out.println("The weather is neutral.");
    }

    else if(temperature <= 0 && temperature <=60 && isRaining == true) {
      System.out.println("The weather is rainy and cold.");
    }

    if(temperature < 0) {
      System.out.println("The weather is below freezing!");
    }
  
  
}
}

I tired doing if(temperature < 0 && isRaining == false) { System.out.println("The weather is below freezing"); } if(temperature < 0 && isRaining == false) { System.out.println("The weather is below freezing"); }

I tired adding the isRaining == true or false to other if else statements that did not require it.

Answer 1

I think user16320675 has given you the answer. I just wanted to add that often (if you are using a method for example) using an else statement can shorten your conditionals since the statements before have already done some of the work. You already have many of these so why not use them?

if(temperature >= 90){
  System.out.println("The weather is extremely hot!");
}

else if(temperature >= 70 && isRaining == false) {
  System.out.println("The weather is mildly hot.");
}

else if(temperature >= 70 && isRaining == true) {
  System.out.println("The weather is rainy and hot.");
}
else if(temperature >= 60) {
  System.out.println("The weather is neutral.");
}
else if(temperature >= 0 && isRaining == true) {
  System.out.println("The weather is rainy and cold.");
}
else if(temperature >= 0) {
  System.out.println("The weather is dry and cold.");
}
else {
  System.out.println("The weather is below freezing!");
}

Answer 2

A couple observations.

• Near the end you are checking temperature twice using the wrong conditional for the first test.

 else if(temperature <= 0 && temperature <=60 && isRaining == true) {
      System.out.println("The weather is rainy and cold.");
    }

• You can combine one of the tests using the conditional operator for isRaining since the temperature range is the same for both tests.

• Since you are using 90 degrees for high temperature I presume you are using Fahrenheit. So you may want to use 32 for below freezing instead of 0 (although less than 0 is certainly below freezing for both scales).

Scanner sc = new Scanner(System.in);
int temperature = sc.nextInt();
boolean isRaining = sc.nextBoolean();
// Write your code below this line!

if(temperature >= 90){
  System.out.println("The weather is extremely hot!");
}

else if(temperature < 90 && temperature > 70) {
  System.out.println("The weather is " + (isRaining ? "rainy and hot." : "mildly hot."));
}

else if(temperature > 60 && temperature < 70) {
  System.out.println("The weather is neutral.");
}

else if(temperature >= 32 && temperature <=60 && isRaining) {
  System.out.println("The weather is rainy and cold.");
} 

else if(temperature < 32) {
  System.out.println("The weather is below freezing!");
}