I want to increment/decrement counter based on button click. 
Scenario: 
There is an initial value on the button- say: 5
When a user clicks on the button, it increments to +1 - o/p: 6
however when the user clicks again on the button it, it'll reduce to 5 again.
this case I dont have 2 buttons- inc and dec to increase/decrease the count.

code:

```
class Hello extends React.Component {
constructor() {
   super()
   this.state = {
     count: 10,

   }
 }
 getCount( c ) {

    const clicked = this.state.clicked
if(c == 1){
  this.setState({count: this.state.count +1, clicked: true});
} else {
  this.setState({count: this.state.count -1})
}

  }
  render() {
    return  <div>
                    <button onClick={this.getCount.bind(this, 1)}> click me for increase </button>
                    <button onClick={this.getCount.bind(this, 0)}> click me for decrease </button>
                    <div><h1>{this.state.count}</h1></div>

                     </div>;
  }
}

ReactDOM.render(
  <Hello name="World" />,
  document.getElementById('root')
);

```