5 December 2018
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2 comments

Can anyone instruct me how to solve it ?

Question about a task Task with percentages

Java Syntax, Level 3, Lesson 3

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Write the code for the addTenPercent method, which increases the passed integer by 10%.
Use the return statement to return the result from the addTenPercent method.

Consider this example:
return 123 * 435;

Requirements:

The addTenPercent method should increase the passed number by 10% percent.
The main method should call the addTenPercent method.
The main method should display the results of the call.
The addTenPercent method should not display anything.

package com.codegym.task.task03.task0304;

/*
Task with percentages

*/

public class Solution {
    public static double addTenPercent(int i) {
        //write your code her
        double tenpercent = (100 / 10) * (1 / 9) ;
      //  System.out.println(tenpercent);
        return (i + tenpercent);
    }

    public static void main(String[] args) {
        System.out.println(addTenPercent(9));
    }
}

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Khurram Level 16, Lahore

7 December 2018, 05:55

the addTenPercent method should increase the value of anything that is passed to it by 10% 1. you have hard coded the value 9 in line 11, you should use the variable ' i ' 2. in line 11, integers are used for the operation but the answer is stored in a double, the program will perform the operation but will store the answer without the decimal part in the double variable 3. even after adjusting the operators to be double, the formula used is incorrect, it converts 9 to 10.11.., the answer here should be 9.9

Guadalupe Gagnon Level 20, Tampa

5 December 2018, 16:43

The correct output to the method should be 9.9 when passed 9 as an argument. Your code spits out 9. The problem is that you are using integers in your calculation instead of doubles. The number is cast to a double after the calculation completes. to fix this try using numbers that include a decimal and a zero (Ex: 10.0 instead of 10). The compiler will recognize the numbers as doubles and correctly calculate fractions of whole numbers then. You still have a math error to figure out, as your code prints out 10.1111111 after applying this. A couple correct formulas to apply (choose one) are: number + (number * 10%) or number * 110%