Cannot find Symbol - variable calories

Question

Why this mistake if I’m setting the calories on ifs?

import java.util.Scanner;
public class Alimentos {
    public static void main(String args[]){
        Scanner in = new Scanner(System.in);
        System.out.println("\nDigite o Alimento (Vegetariano, Peixe, Frango ou Carne): ");
        String alimento = in.nextLine();
        System.out.println("\nDigite a Bebida (Chá, Refri Diet, Suco de melancia ou Suco de Laranja): ");
        String bebida = in.nextLine();
        System.out.println("\nDigite a Sobremesa (Abacaxi, Sorvete, Sorvete Diet ou Mousse): ");
        String sobremesa = in.nextLine();
        int calorias = 350;
        int caloriasbebida = 100;
        int caloriassobremesa = 200;
    if(alimento.toLowerCase().equals("vegetariano")){
        int calorias = 180;
    } else if(alimento.toLowerCase().equals("peixe")){
        int calorias = 230;
    } else if(alimento.toLowerCase().equals("frango")){
        int calorias = 250;
    }

    if(bebida.toLowerCase().equals("chá")){
        int caloriasbebida = 20;
    } else if(bebida.toLowerCase().equals("refri diet")){
        int caloriasbebida = 65;
    } else if(bebida.toLowerCase().equals("suco de melancia")){
        int caloriasbebida = 70;
    }

    if(sobremesa.toLowerCase().equals("abacaxi")){
        int caloriassobremesa = 75;
    } else if(sobremesa.toLowerCase().equals("sorvete")){
        int caloriassobremesa = 170;
    } else if(sobremesa.toLowerCase().equals("sorvete diet")){
        int caloriassobremesa = 110;
    }
    int resultado = calorias+caloriasbebida+caloriassobremesa;
    System.out.println("Total de Calorias da Refeição: " +resultado);
}
}

Answer 1

You are declaring the variables within the if then they only exist within it, when it comes out, they no longer exist. You need to learn about scope (this gives an introduction but to learn it would be good to follow all the concepts in a good book).

When a variable is declared within a scope, it ceases to exist when it leaves this scope. Where there is a block (usually enclosed by keys { }) you are creating a new scope. An internal scope to another scope "inherits" variables in the previous scope.

import java.util.Scanner;

class Alimento {
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("\nDigite o Alimento (Vegetariano, Peixe, Frango ou Carne): ");
        String alimento = in.nextLine();
        System.out.println("\nDigite a Bebida (Chá, Refri Diet, Suco de melancia ou Suco de Laranja): ");
        String bebida = in.nextLine();
        System.out.println("\nDigite a Sobremesa (Abacaxi, Sorvete, Sorvete Diet ou Mousse): ");
        String sobremesa = in.nextLine();
        int calorias = 350;
        int caloriasbebida = 100;
        int caloriassobremesa = 200;
        if (alimento.toLowerCase().equals("vegetariano")) calorias = 180;
        else if (alimento.toLowerCase().equals("peixe")) calorias = 230;
        else if (alimento.toLowerCase().equals("frango")) calorias = 250;
        if (bebida.toLowerCase().equals("chá")) caloriasbebida = 20;
        else if (bebida.toLowerCase().equals("refri diet")) caloriasbebida = 65;
        else if (bebida.toLowerCase().equals("suco de melancia")) caloriasbebida = 70;
        if (sobremesa.toLowerCase().equals("abacaxi")) caloriassobremesa = 75;
        else if (sobremesa.toLowerCase().equals("sorvete")) caloriassobremesa = 170;
        else if (sobremesa.toLowerCase().equals("sorvete diet")) caloriassobremesa = 110;
        int resultado = calorias + caloriasbebida + caloriassobremesa;
        System.out.println("Total de Calorias da Refeição: " + resultado);
    }
}

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.

This code still has a problem if the user does not enter anything.

I optimized your original question code by initializing the variable calorias with 350, to kill all else.

I take this opportunity to say that it would be good to organize the code in a more standardized way. This helps to understand what is happening.