Average data entered algorithm

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Average data entered algorithm

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#1 by (3 votes)
#2 by (2 votes)

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package ifal2;
import java.util.Scanner;

public class Lista3Questao4 {

    public static void main(String[] args) {
        Scanner entrada = new Scanner(System.in);


        int idade=0, contM=0, contF=0;
        double soma=0, somaaltura=0, somaM=0, percentual=0, altura;
        String sexo;

        for(int x=0; x < 3; x++) {
        System.out.println("Digite o sexo: ");
        sexo = entrada.next();
        System.out.println("Digite a idade: ");
        idade = entrada.nextInt();
        System.out.println("Digite a altura: ");
        altura = entrada.nextDouble();

        soma = soma + idade;

        if (sexo == "1") {
        somaM = somaM + idade;
        contM++;
        }
                        if (sexo == "0") {
                        somaaltura = somaaltura + altura;
                        contF++;
                        }

                somaM = somaM/contM;
                somaaltura = somaaltura/contF;

                        if (idade >= 18 && idade <= 35) {
                                percentual = percentual + idade;
                                }

        }
        System.out.println("Média da idade (geral) " + (soma/3));
        System.out.println("Média da altura (feminino) " + (somaaltura));
        System.out.println("Média da idade (masculino) " + (somaM));
        System.out.println("Percentual de pessoas com idade entre 18-35 anos: " + (percentual/3));


    }
}

A survey was carried out among the 1000 inhabitants of a region to collect   the following data:   sex (0-female, 1-male), age and height.   make an algorithm that reads the collected information and show the following information:

a) mean age of the group; OK *

b) mean height of women; OK *

c) mean age of men; OK *

d) percentage of people aged between 18 and 35 years (inclusive)

I'm not getting the average age and height. Letra "d" also.

I put 3 in the repeat structure just to make it easier.

java algoritmo

asked by anonymous 01.08.2018 / 04:28

2 answers

Generate querysets from dynamically generated rules Zoom the default page

score 3 · Answer 1

It has several problems in the code and this is mainly caused because it is a complete mess. I just understood after rewriting everything:

import java.util.Scanner;

public class Program {
    public static void main(String[] args) {
        Scanner entrada = new Scanner(System.in);
        int soma = 0, somaM = 0, somaF = 0, contM = 0, contF = 0, contJ = 0;
        for (int x = 0; x < 3; x++) {
            System.out.println("Digite o sexo: ");
            int sexo = entrada.nextInt();
            System.out.println("Digite a idade: ");
            int idade = entrada.nextInt();
            System.out.println("Digite a altura: ");
            int altura = entrada.nextInt();
            soma += idade;
            if (sexo == 1) {
                somaM += idade;
                contM++;
            } else if (sexo == 0) {
                somaF += altura;
                contF++;
            }
            if (idade >= 18 && idade <= 35) contJ++;
        }
        System.out.println("Média da idade (geral) " + ((double)soma / 3));
        System.out.println("Média da altura (feminino) " + ((double)somaF / contF));
        System.out.println("Média da idade (masculino) " + ((double)somaM / contM));
        System.out.println("Percentual de pessoas com idade entre 18-35 anos: " + (100 / 3 * (double)contJ));
    }
}

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

I simplified some things that could be simpler, among them to leave sex as numerical since it is not using the commonly used letters, and I preferred to use height as centimeters. I could have given better names, tested the sex to see if it is ok, I ended up leaving neutral if it is something invalid.

I do not even know how to explain everything I've done so different that I ended up leaving. I remember that had the average calculation occurred inside the loop, which does not make sense, you can only calculate it after having all information. I had conceptual errors adding things that should not, well, much of the problem is mathematical.

score 2 · Answer 2

You should count how many people are between 18 and 35, and not add up to the ages of those who satisfy the condition.

So instead of:

if (idade >= 18 && idade <= 35) {
    percentual = percentual + idade;
}

You should:

/* Inicializando variáveis */
int pessoasRangeIdade = 0;

/* Dentro do for */
if (idade >= 18 && idade <= 35) {
    pessoasRangeIdade++;
}

/* Após o for */
percentual = pessoasRangeIdade/3; //Sendo 3 a quantidade total de pessoas - Sugiro deixar dinâmico na entrada do programa.

System.out.println("Percentual de pessoas com idade entre 18-35 anos: " + (percentual));