Interest calculation

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[Engelbrecht et al., 2012] Develop a program that receives from the user, the value of an application and the value of the initial interest rate. Considering that this interest rate increases by 0.025% per month, then store in vectors with 12 elements each:

     
  • The value of interest rates each month
    •   
  • The amount of interest in each month
    •   
  • And the application value corrected each month
    •   

    After this, show the initial application value and the contents of the   vectors.

         

    How do I do this program? I can not do it for the   interest rates will increase.

         

    * Ex: Month 1 = 0.025%, Month 2 = 0.050%, Month 3 = 0.075%. 

    #include <cstdlib>
#include <iostream>
#include <stdio.h>
#include <math.h>
using namespace std;


int vetor[12];
float apini;
float txjini;
int num;


 int main(int argc, char** argv) {

   cout<<"Informe o valor da aplicacao inicial: "<<endl;
   cin>>apini;
   cout<<"Informe o valor da taxa de juros inicial: "<<endl;
   cin>>txjini;

  for(int i = 0; i<=12; i++)
  {
    txjini = (vetor[i]*0,025);
    cout<<"O valor das taxas de juros em cada mes e de:  "<<txjini<<endl;   
  }

return 0;
 }
        
    asked by anonymous 30.11.2017 / 22:04

    2 answers

    3
    If the interest rate has to vary with each installment then you have to use a variable that increments the installment to calculate the new interest, nothing changes without a variation, the calculation was being done without it. I was still not considering the amount applied and the initial interest rate.

    I just doubted the question. I improved the readability of the code. I did not use the array because it is not necessary to solve the question. And when you create it, it's a lot more complicated than you were doing, you'll need to create a struct or class for each plot.

    stream this code is C and not C ++.

    Do not use floating point binary in monetary values . 

    #include <iostream>
using namespace std;

int main() {
    cout << "Informe o valor da aplicacao inicial: " << endl;
    float ValorInicial;
    cin >> ValorInicial;
    cout << "Informe o valor da taxa de juros inicial: " << endl;
    float JurosInicial;
    cin >> JurosInicial;
    JurosInicial /= 100;
    for (int i = 0; i < 12; i++) {
        cout << "O valor das taxas de juros em cada mes e de:  " << ValorInicial * (JurosInicial + 0.025 * i) << endl;
    }
}

    See running on ideone . And no Coding Ground . Also I put GitHub for future reference .

        
    30.11.2017 / 22:22
    0

    You would have to store the interest rate for each month in a vector with 12 positions.

    Ex: 

    float txj[12];

    And then in for() you do so: 

    for(int i = 0; i <= 12; i++)
{
    txj[i] = (i + 1) * txjini;

    cout << "Juros do mes " << i << ": " << txj[i] << endl;
}
    More or less. :)

        
    30.11.2017 / 22:14
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