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class MetrToInchTab {
    public static void main (String args []) {
        double inch, metrs;
        int counter;
        counter = 0;
        for (metr = 1; inch<= 100; inch ++) {
            inch = metr * 39.37;
            System.out.println (metr + " Metr equal " + inch + " inches.");
            counter ++; 
            if (counter == 12) {
             System.out.println ();
             counter=0;
            }
        }
    }
}

Main.java:6: error: cannot find symbol
        for (metr = 1; inch<= 100; inch ++) {
             ^
  symbol:   variable metr
  location: class MetrToInchTab
Main.java:7: error: cannot find symbol
            inch = metr * 39.37;
                   ^
  symbol:   variable metr
  location: class MetrToInchTab
Main.java:8: error: cannot find symbol
            System.out.println (metr + " Metr equal " + inch + " inches.");
                                ^
  symbol:   variable metr
  location: class MetrToInchTab
3 errors

Standard output is empty