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Thread: Need Help with this Java Calculator

  1. #1
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    Default Need Help with this Java Calculator

    Hello, I'm a beginner at this. This is my assignment and I need to program a calculator. Here is what i have so far:


    import java.util.Scanner;
    public class IntCalc { 
         public static void main(String[] args) 
         { 
                Scanner keyboard = new Scanner (System.in);
                BigDecimal princ = 0;
    double interest = 0;
    char added = '\0';
    char type = '\0';
    int years = 0;
    boolean clear = false;
    boolean done = false;
    menu(princ, interest, added, type);
    while(!clear)
    {
    //checking for valid inputs
    if((added != 'a' || added != 's' || added != 'q') && (type != 's' || type != 'c'))
    {
    System.out.println("There was an error in your input, please try again.");
    menu(princ, interest, added, type);
    }
    else clear = true;
    }
    String header = "Period     Beginning Amount     Interest Earned     Ending Amount   ";
    String out = "";
    if(type == 's') out = calcSimple(princ, interest, added, years);
    else out = calcComp(princ, interest, added, years);
    System.out.println(header);
    System.out.println(out);
    }
     
    public String calcSimple(BigDecimal princ, double interest, char added, int years)
    {
    String o;
    BigDecimal amnt = princ;
    BigDecimal intEarned = princ*interest;
    int num = 0;
    if(added == 's') num = years*2;
    else if(added == 'q') num = years*4;
    for(int x = 0; x < num; x++)
    {
    o += IntegertoString(x+1) + "    " + IntegertoString(amnt) + "    " + intEarned + "    " + amnt+intEarned + "\n";
    amnt += intEarned;
    }
    return o;
    }
    public String calcComp(BigDecimal princ, double interest, char added, int years)
    {
    String o;
    Decimal amnt = princ;
    BigDecimal intEarned = princ*interest;
    int num = 0;
    if(added == 's') num = years*2;
    else if(added == 'q') num = years*4;
    for(int x = 0; x < num; x++)
    {
    o += IntegertoString(x+1) + "    " + IntegertoString(amnt) + "    " + princ*interest + "    " + amnt+intEarned + "\n";
    amnt += intEarned;
    intEarned = princ*interest;
    }
    return o;
    }
    public void menu(BigDecimal princ, double interest, char added, char type, int years)
    {
    System.out.println ("This program will calculate simple and compound interest.");
            System.out.println (" ");
            System.out.println ("What is the principle amount?");
    		  princ=input.next();
            System.out.println ("What is the interest rate?");
            interest=input.next();
    System.out.println ("Will the interst be added anualy, semi-anualy or quartely? (a, s, q)");
    		  added=input.next();
    System.out.println("Is the interst simple or compound? (s, c)");
    		  type=input.next();
    System.out.println("How many years would you like to calculate the interest for?");
      	 	  years=input.next();
    }
    }




    This is the Error Message I'm getting when I try to compile:

     ----jGRASP exec: javac -g IntCalc.java
    IntCalc.java:32: cannot find symbol
    symbol  : class BigDecimal
    location: class IntCalc
    public String calcSimple(BigDecimal princ, double interest, char added, int years)
                             ^
    IntCalc.java:47: cannot find symbol
    symbol  : class BigDecimal
    location: class IntCalc
    public String calcComp(BigDecimal princ, double interest, char added, int years)
                           ^
    IntCalc.java:63: cannot find symbol
    symbol  : class BigDecimal
    location: class IntCalc
    public void menu(BigDecimal princ, double interest, char added, char type, int years)
                     ^
    IntCalc.java:6: cannot find symbol
    symbol  : class BigDecimal
    location: class IntCalc
                BigDecimal princ = 0;
                ^
    IntCalc.java:35: cannot find symbol
    symbol  : class BigDecimal
    location: class IntCalc
    BigDecimal amnt = princ;
    ^
    IntCalc.java:36: cannot find symbol
    symbol  : class BigDecimal
    location: class IntCalc
    BigDecimal intEarned = princ*interest;
    ^
    IntCalc.java:42: cannot find symbol
    symbol  : method IntegertoString(int)
    location: class IntCalc
    o += IntegertoString(x+1) + "    " + IntegertoString(amnt) + "    " + intEarned + "    " + amnt+intEarned + "\n";
         ^
    IntCalc.java:50: cannot find symbol
    symbol  : class Decimal
    location: class IntCalc
    Decimal amnt = princ;
    ^
    IntCalc.java:51: cannot find symbol
    symbol  : class BigDecimal
    location: class IntCalc
    BigDecimal intEarned = princ*interest;
    ^
    IntCalc.java:57: cannot find symbol
    symbol  : method IntegertoString(int)
    location: class IntCalc
    o += IntegertoString(x+1) + "    " + IntegertoString(amnt) + "    " + princ*interest + "    " + amnt+intEarned + "\n";
         ^
    IntCalc.java:68: cannot find symbol
    symbol  : variable input
    location: class IntCalc
    		  princ=input.next();
                            ^
    IntCalc.java:70: cannot find symbol
    symbol  : variable input
    location: class IntCalc
            interest=input.next();
                     ^
    IntCalc.java:72: cannot find symbol
    symbol  : variable input
    location: class IntCalc
    		  added=input.next();
                            ^
    IntCalc.java:74: cannot find symbol
    symbol  : variable input
    location: class IntCalc
    		  type=input.next();
                           ^
    IntCalc.java:76: cannot find symbol
    symbol  : variable input
    location: class IntCalc
      	 	  years=input.next();
                            ^
    15 errors
     
     ----jGRASP wedge: exit code for process is 1.
     ----jGRASP: operation complete.


    PLEASE HELP ME. Thank you
    Last edited by jo112205; December 13th, 2011 at 04:28 AM.


  2. #2
    Think of me.... Mr.777's Avatar
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    Default Re: Need Help with this Java Calculator

    BigDecimal is a class in java.math package and you can not access it directly so you need to import it as,
    import java.math.BigDecimal;

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