String to Double or Float

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hello guys.. i do really need some help here. i have to do the 4 basic mathematical operation by entering 2 numbers with decimal.

example.

1st num: 12.50
2nd num: 6.5

the answer must be in float or double but with my code below, upon entering a double or float numbers it will show this error:

java.lang.Numbe rFormatExceptio n: 2.0
at java.lang.Integ er.parseInt(Int eger.java:414)
at java.lang.Integ er.parseInt(Int eger.java:454)
at elvar.promptFor Int(elvar.java: 46)
at elvar.main(elva r.java:19)
Exception in thread "main"


import java.io.*;

public class elvar {

public static void main (String args[]) {

float a, b;
float sum, diff, quo, prod;
a = promptForInt("E nter 1st integer: ");
b = promptForInt("E nter 2nd integer: ");
sum = a + b;
diff = a - b;
quo = a/b;
prod = a* b;

System.out.prin tln("The total is: " + sum);
System.out.prin tln("The difference is: " + diff);
System.out.prin tln("The quotient is: " + quo);
System.out.prin tln("The product is: " + prod);

}


static float promptForInt(St ring prompt) {

System.out.prin t(prompt);
System.out.flus h();
String s= "";

BufferedReader ds =
new BufferedReader( new InputStreamRead er(System.in));
try {
s = ds.readLine();
} catch (IOException e){
System.out.prin tln(e);
}
return Integer.parseIn t(s);
}

i really appreciate some help guys. thanx a lot in advance.
}

[r035198x]

hello guys.. i do really need some help here. i have to do the 4 basic mathematical operation by entering 2 numbers with decimal.

example.

1st num: 12.50
2nd num: 6.5

the answer must be in float or double but with my code below, upon entering a double or float numbers it will show this error:

java.lang.Numbe rFormatExceptio n: 2.0
at java.lang.Integ er.parseInt(Int eger.java:414)
at java.lang.Integ er.parseInt(Int eger.java:454)
at elvar.promptFor Int(elvar.java: 46)
at elvar.main(elva r.java:19)
Exception in thread "main"


import java.io.*;

public class elvar {

public static void main (String args[]) {

float a, b;
float sum, diff, quo, prod;
a = promptForInt("E nter 1st integer: ");
b = promptForInt("E nter 2nd integer: ");
sum = a + b;
diff = a - b;
quo = a/b;
prod = a* b;

System.out.prin tln("The total is: " + sum);
System.out.prin tln("The difference is: " + diff);
System.out.prin tln("The quotient is: " + quo);
System.out.prin tln("The product is: " + prod);

}


static float promptForInt(St ring prompt) {

System.out.prin t(prompt);
System.out.flus h();
String s= "";

BufferedReader ds =
new BufferedReader( new InputStreamRead er(System.in));
try {
s = ds.readLine();
} catch (IOException e){
System.out.prin tln(e);
}
return Integer.parseIn t(s);
}

i really appreciate some help guys. thanx a lot in advance.
}

1.) Next time please use code tags when posting code.
2.) You use Integer.parseIn t for changing a string value to an integer value. To change from a string to a double value, you should use Double.parseDou ble and to change from a string to a float you ...well I'm sure you now get the pattern.

[KishoreM]

You have to modify your promptForInt() method as follow

 static float promptForInt(String prompt) {
 
    System.out.print(prompt);
    System.out.flush();
    String s= "";
 
    BufferedReader ds = 
    new BufferedReader(new InputStreamReader(System.in));
    try {
    s = ds.readLine();
    } catch (IOException e){
    System.out.println(e);
    }
    float i= Float.parseFloat(s);
 
    return i;
    }