Factorical Number 5 teke chotto example 4 3 2 1 

chackButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {

        String ed = edittext.getText().toString();
        int num = Integer.parseInt(ed);
        int fact = 1;

        for (int i = num; i>=1; i--){
            fact = fact * i;
        }

        display.append("Factorial of  "+num+" = "+fact);

    }
});

 


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