So, I tried to make a simple pythagoras app that can measure the side length of a triangle after inputting the length of the 2 other sides. To measure that side, user supposed to input 'x' or 'X' into one of three sides of the triangle. Here's my code:
import java.util.Scanner;
public class pythagoras_1 {
public static void main (String Args[]){
//string data type to check user input 'x' or not
String shypo,scat1,scat2;
double hypo, cat1, cat2;
boolean hypoSelected, cat1Selected, cat2Selected;
Scanner console = new Scanner (System.in);
System.out.print( "Hypotenuse = ");
shypo = console.next();
System.out.print("Cathetus 1 = ");
scat1 = console.next();
System.out.print("Cathetus 2 = ");
scat2 = console.next();
hypoSelected = shypo.equals("x")||shypo.equals("X");
cat1Selected = scat1.equals("x")||scat1.equals("X");
cat2Selected = scat2.equals("x")||scat2.equals("X");
if(hypoSelected){
cat1 = Double.parseDouble(scat1);
cat2 = Double.parseDouble(scat2);
System.out.println("Hypotenuse = "+ hypoC(cat1,cat2));
}
else if(cat1Selected){
hypo = Double.parseDouble(shypo);
cat2 = Double.parseDouble(scat2);
System.out.println("cathetus 1 = "+ Cat1C(hypo,cat2));
}
else if(cat2Selected){
hypo = Double.parseDouble(shypo);
cat1 = Double.parseDouble(scat1);
System.out.println("cathetus 2 = "+ Cat2C(hypo,cat1));
}
else{
System.err.println("ERROR");
}
}
//HERE THE METHOD FUNCTION
public static double hypoC(double cat1,double cat2){
double ohypo;
ohypo = Math.sqrt((cat1*cat1)+(cat2*cat2));
return ohypo;
}
public static double Cat1C(double hypo,double cat2){
double ocat1;
ocat1 = Math.sqrt((hypo*hypo)-(cat2*cat2));
return ocat1;
}
public static double Cat2C(double hypo,double cat1){
double ocat2;
ocat2 = Math.sqrt((hypo*hypo)-(cat1*cat1));
return ocat2;
}
}
But it works only on hypotenuse(the first if-statement), if I input 'x' on cathetus 1 or 2 the app ends without executing the code. How can I fix this?
here's the output when scat1 or scat 2 value is 'x'
run:
Hypotenuse = 5
Cathetus 1 = 4
Cathetus 2 = x
ERROR
BUILD SUCCESSFUL (total time: 5 seconds)
here's the output when shypo is 'x'
run:
Hypotenuse = x
Cathetus 1 = 4
Cathetus 2 = 3
Hypotenuse = 5.0
BUILD SUCCESSFUL (total time: 6 seconds)
Error i was getting in your code were typo's and parsing exception since it was trying to parse x to double, that's the reason it was not executing code. check logs of your program for that.
Corrected Main function of your program
public static void main(String Args[]) {
String shypo, scat1, scat2;
Scanner console = null;
try {
console = new Scanner(System.in);
// input of each side
System.out.print("hypotenuse = ");
shypo = console.next();
System.out.print("cathetus 1 = ");
scat1 = console.next();
System.out.print("cathetus 2 = ");
scat2 = console.next();
if ("x".equalsIgnoreCase(shypo)) {
System.out.println("Hypotenuse = " + hypoC(Double.parseDouble(scat1), Double.parseDouble(scat2)));
} else if ("x".equalsIgnoreCase(scat1)) {
System.out.println("cathetus 1 = " + Cat1C(Double.parseDouble(shypo), Double.parseDouble(scat2)));
} else if ("x".equalsIgnoreCase(scat2)) {
System.out.println("cathetus 2 = " + Cat2C(Double.parseDouble(shypo), Double.parseDouble(scat1)));
} else {
System.err.println("ERROR");
}
} finally {
if (console != null)
console.close();
}
}
You've got loads of typos:
cat2Selected = scat1.equals("x")||scat1.equals("X");
Change scat1
to scat2
This is the key one:
hypo = Double.parseDouble(shipo);
shipo
should be shypo
, as otherwise hypo
is undefined in calls to Cat1C
or Cat2C
. and further, 'x'
is not going to parse as a Double
. You could place the definitions of hypo
, cat1
and cat2
inside the condition.
Finally:
ohipo = Math.sqrt((cat1*cat1)+(cat2*cat2));
ohipo
should be ohypo
.
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