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Kop
Asked: 2022-10-22 05:47:03 +0800 CST 2022-10-22 05:47:03 +0800 CST

Problem calculating multiple percentages in Java

  • 772

I'm just starting out with Java and I'm stuck with this problem, for which I can only use For loops and the Math class. The problem is that I can not increase the rate. This is what should appear on the screen:

5 years 250.0(1.0%) 375.0(1.5%) 500.0(2.0%) 625.0(2.5%)
6 years 300.0(1.0%) 450.0(1.5%) 650.0(2.0%) 750.0(2.5%)
7 years 350.0(1.0% ) 525.0(1.5%) 700.0(2.0%) 875.0(2.5%)
8 years 400.0(1.0%) 600.0(1.5%) 800.0(2.0%) 1000.0(2.5%)

and this what I get:

5 years 250.0(1.0%) 250.0(1.5%) 250.0(2.0%) 250.0(2.5%)
6 years 250.0(1.0%) 250.0(1.5%) 250.0(2.0%) 250.0(2.5%)
7 years 250.0(1.0% ) 250.0(1.5%) 250.0(2.0%) 250.0(2.5%)
8 years 250.0(1.0%) 250.0(1.5%) 250.0(2.0%) 250.0(2.5%).

This is the code I have so far:

   double capitalInicial = 5000.0;
   double tasa = 1.0;
   int anios = 5;
   double intereses = capitalInicial * tasa / 100 * anios;
   for(int i = 5; i <= 8; i++) {
   System.out.println(i + " años \t" + intereses + "(1.0%) \t" + intereses + "(1.5%) \t" + intereses + "(2.0%) \t" + intereses + "(2.5%) \t");

I appreciate the help.

java

3 Answers

  1. Best Answer

    Problem:

    You would have to move a double intereses = capitalInicial * tasa / 100 * anios;inside your loop forand replace a anioswith the for ( i) iterator, since it intereseswas only being calculated once, which is why the same result was repeated every time.

    Solution:

    Now, for you to have the same results as the exercise, you would have to multiply interesesby the percentages requested (1.0%, 1.5%, 2.0%, 2.5%) . Let's see:

    public static void main(String[] args) {
    double capitalInicial = 5000.0;
    double tasa = 1.0;
    for (int i = 5; i <= 8; i++) {
        double intereses = capitalInicial * tasa / 100 * i;
        System.out.println(i + " anios \t" + intereses*(1.0) + "(1.0%) \t" + intereses*(1.5) + "(1.5%) \t" + intereses*(2.0) + "(2.0%) \t" + intereses*(2.5) + "(2.5%) \t");
    }
}

    Output:

    // 5 anios    250.0(1.0%)     375.0(1.5%)    500.0(2.0%)    625.0(2.5%)     
// 6 anios    300.0(1.0%)     450.0(1.5%)    600.0(2.0%)    750.0(2.5%)     
// 7 anios    350.0(1.0%)     525.0(1.5%)    700.0(2.0%)    875.0(2.5%)     
// 8 anios    400.0(1.0%)     600.0(1.5%)    800.0(2.0%)    1000.0(2.5%)
    • 1

  2. It is because interesesit is calculated only once. For it to change each year it must be inside the for, and the counter can be used ias the value of the year:

        double capitalInicial = 5000.0;
    double tasa = 1.0;
    for (int i = 5; i <= 8; i++) {
        double intereses = capitalInicial * tasa / 100 * i;
        System.out.println(i + " años \t" + intereses + "(1.0%) \t" + intereses + "(1.5%) \t" + intereses + "(2.0%) \t" + intereses + "(2.5%) \t");
    }
    • 0

  3. Thank you very much for the answers, indeed the problem was calculating interest outside of the For and also not multiplying the interest. Thanks again and I hope to continue learning.

    • -1