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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		float w;
        float h; 
        float a;
        IO.output("Enter the width of the triangle: ");
        w=IO.inputFloat();
        IO.output("Enter the height of the triangle: ");
        h=IO.inputFloat();
        a=(w*h)/2.0;
        IO.outputln("The triangle area = "+a);
	}
}

Main.java:15: error: cannot find symbol
        IO.output("Enter the width of the triangle: ");
        ^
  symbol:   variable IO
  location: class Ideone
Main.java:16: error: cannot find symbol
        w=IO.inputFloat();
          ^
  symbol:   variable IO
  location: class Ideone
Main.java:17: error: cannot find symbol
        IO.output("Enter the height of the triangle: ");
        ^
  symbol:   variable IO
  location: class Ideone
Main.java:18: error: cannot find symbol
        h=IO.inputFloat();
          ^
  symbol:   variable IO
  location: class Ideone
Main.java:19: error: incompatible types: possible lossy conversion from double to float
        a=(w*h)/2.0;
               ^
Main.java:20: error: cannot find symbol
        IO.outputln("The triangle area = "+a);
        ^
  symbol:   variable IO
  location: class Ideone
6 errors

Standard output is empty